So long and thanks for all the fish

I recently came across this summary of the state of the world's marine life after decades of industrial scale pollution, warming, acidification, trawling, nutrient runoff and overfishing. It is from this paper.

Our ecological crises: Wake up and smell the stats

I'd like to put together a list of credible ecological statistics from reputable sources as a resource. Please post links to any such existing lists you are aware of or add any that have grabbed your attention (please make sure you include a source). To start us off, here are a few off the top of my head and in no particular order:

• Humans now affect over 80% of the world's land, 100% of the oceans and 100% of the atmosphere. Around 40% of the oceans have been "strongly affected" by our activities.

• Half of the world’s tropical forests have disappeared since World War II and roughly another 10 million hectares are being felled each year — the equivalent of 40 football fields every minute. The majority are being cleared by illegal loggers.

• Seventy-seven percent of global fisheries are fully exploited, over exploited or have been depleted. Based on 1998 data, the UN Food and Agriculture Organization estimates that global fishing fleets "are 2.5 times larger than needed."

• Marine apex predator numbers (i.e. large fish and sharks) have declined by 90% over the last 50-100 years, mainly due to overfishing (more stats on marine life decline). Another recent study put tuna decline at 60% in the last 50 years.

• Deep-sea trawling damages an area of sea bed twice the size of the contiguous USA each year.

• We're removing 9-10,000 tonnes of fish from the ocean every hour.

• As far as we can work out (and there are wide error margins on this one), species are currently going extinct at something like 100-1000 times the background rate of extinction, faster than at any time since the extinction of the dinosaurs 65 million years ago. It is likely that somewhere between 5,000 and 30,000 species become extinct each year. All the primary drivers of these trends are linked to human activities: land use changes, habitat destruction, pollutants, invasive species, anthropogenic climate change.

• Twenty-two percent of the world's plant species are threatened, and another 33% have an unknown status.

• Twenty-two species of Australian mammals become extinct between 1900 and 1960. Recently, mammal populations in Kakadu have gone into freefall.

• In the 1950s there were 450,000 lions worldwide and now there are only 20,000. Leopards are down from 700,000 to 50,000, cheetahs from 45,000 to 12,000 and tigers from 50,000 to just 3,000. And in the last forty years, elephant numbers have halved across protected areas in West and Central Africa. Globally, since 1970, wild vertebrate numbers have declined by almost one third.

• One study in 2001 put the annual cost of alien invasive species to the global economy at US$1.4 trillion annually, or about 5% of total GDP.

• Overall, current ecological damage is estimated to cost the global economy US$6.6 trillion annually (yes, with a "t").

• An area of arable land roughly the size of Greece or Nepal is lost to soil erosion and desertification each year. Since 1950, 1.9 billion hectares (4.7 billion acres) of land around the world has become degraded.

• By 1995, humans consumed 20% of global net terrestrial primary production. By 2005, it was 25%.

• Earth overshoot day occurs earlier each year. This is a notional measure designating the point in the year where global consumption exceeds the annual renewable biocapacity of the planet. In 2011, it falls on 27th September. Another way of saying this is that in 2010 the worldwide human population used about 135% of the resources the earth can generate in a year.

• Between 2000 and 2010, the number of cars and motorcycles in China increased twentyfold and there are now between 800 million and one billion cars in the world.

• As we burn 196,442 kilos of coal, 103,881,279 litres of natural gas and 150,179 litres of oil a second, we're dumping 62,500 tonnes of heat-trapping emissions into the earth's atmosphere every minute. Since the industrial revolution, we have increased the carbon dioxide in the atmosphere by more than 40% and increased the acidity of the oceans by 30% (a rate faster than anything seen before in Earth's history). The radiative forcing of the carbon dioxide human activities have put in the atmosphere is the equivalent of adding the energy of more than ten Hiroshima bombs every second and is likely the most significant contributing factor in Greenland losing around 9000 tonnes of ice every second (and accelerating), in about 90% of glaciers globally retreating, in precipitating the largest marine migration in two million years due to warming oceans and in ensuring that the last 318 consecutive months have had a global temperature above the 20th century average. The last month with below average temperatures was February 1985.

• Arctic summer sea ice has declined by 40% in extent and more than 75% in volume over the last three decades and 2011 saw new records for lowest extent and volume since records began. Due to increased summer melt, the fabled North West passage through the remote islands of Canada has been open to commercial shipping without icebreakers only four times in recorded history: 2011, 2010, 2008, 2007.

• Nearly 5.5 billion people (about 80% of global human population) live in an area where rivers are seriously threatened.

• The rate at which we are extracting groundwater has more than doubled between 1960 and 2000 and since 1960 18 trillion tonnes of water have been removed from underground aquifers without being replaced, enough to raise global sea levels by an average of 5 cm.

• In 1960, the Aral Sea was the world's fourth largest lake yet by 2000 it had shrunk to 20% of its original size due to over-irrigation on its feeder rivers.

• We put more than six million tonnes of plastic in the oceans annually, which is something like eight million pieces of litter each day, and over 119,000 items floating on every square kilometre of ocean.

• It is likely humanity has had a greater effect on the nitrogen cycle than any other phenomenon for the last 2.5 billion years.

Note that none of these are projections of present trends, they all relate simply to our present condition. This is currently an unsystematic sample; I have not (yet) tried to cover all of the various ecological and resource crises. This post may grow as I continue to gather more information.
I also posted some further statistics back here, though have not had a chance to post links to all the sources of those, and their credibility is something of a mixed bag.

Where have all the fish gone?

"Just don't go to the mall. Bush told us to win the war by going shopping. But if we want to really win the war about the economy, don't go shopping, and don't buy all the crap that sits in your cupboard and you never use. So, we can't [just] unscrew a lightbulb. We have to fix everything at the same time now. We have to stop overfishing, we have to stop pollution. We have to stop climate changing. When people ask me, 'what's the biggest problem: fishing, climate change or pollution?', I say 'yes' because it's all of it. And this requires fundamental changes in the way we fish, the way we raise our food, the way we produce our products and the way we get our energy for everything we do. And that's scary."

- Jeremy Jackson, Ritter Professor of Oceanography and Director of the Center for Marine Biodiversity and Conservation at the Scripps Institution of Oceanography.

Today is world oceans day, so I thought I would share this thoroughly depressing lecture. If you'd like to sleep tonight, might be better to skip it. I am not sure why the slides are blurred (I assume some kind of copyright issue). It's a shame, but you can still make most of them out. A couple of pithy quotes worth taking down:

"Ninety-five percent of what passes for conservation biology is the ever more sophisticated refinement of the obituary of nature, rather than doing something about it."

"What is farmed salmon? We're raising cows to feed to tigers, to eat tiger burgers. That's what salmon is. It's an apex predator. We go out and we drag the oceans and we get all this trash fish which we turn into forty percent protein pellets to feed to the salmon."

While we're on memorable quotes about the ocean, here are two from a fascinating documentary on overfishing called End of the Line, which I've been intending to blog about it for some time. The two money quotes are “We are fighting a war against the fish - and we are winning!” and “People always ask me - where have all the fish gone? and I tell them, we have eaten them!” Here is the trailer.

And while I'm compiling a somewhat random collection of things related to ocean ecology, here are three more links:

• Acidification: why small numbers matter. A change of pH of 0.1 might seem small, but if it occurred in your bloodstream, it would be sufficient to make you quite sick.

• FAO: Fish consumption reaches all time high.

• Science Daily: Ocean acidification will reduce diversity.

Happy World Oceans Day!

Ecological responsibility and Christian discipleship I: Human planet

This will be the first in three posts giving a slightly modified version of a sermon I delivered a few weeks ago based on Genesis 1. The three posts are as follows:
I. Human planet: Welcome to the Anthropocene.
II. The Community of Creation: Genesis 1.
III. Recycle or repent? Our response.

Human Planet: Welcome to the Anthropocene
We no longer live on the same planet on which we were born. I’m not just talking about the internet and globalisation, or trends in fashion and music. The chemistry of the oceans and atmosphere, the stability of the climate, the diversity and health of ecosystems are all very different to what they were. Human activity over the last handful of decades has altered the face of the globe in ways so profound that it will be visible in the geological record millions of years into the future. The Geological Society of London, which is the UK national society for geoscience and the oldest geological society in the world, is currently considering a serious proposal to declare that we have now left the Holocene and entered into a new geological epoch, called the Anthropocene, named after anthropos, which is Greek for human, because we humans are having such a extreme effect on all the ecosystems and even geology of the planet. I hardly need to tell you that most of it isn't a positive effect.

Think of the most remote places on the planet, places so wild and desolate that none live there. No matter where you picture, human fingerprints are all over the landscape.

You are probably aware that Arctic summer sea ice is in terminal decline and many of us in this room are likely to live to see a largely ice-free Arctic in summers to come. This winter, while we shivered through a December that was 5ºC below average, parts of the Canadian Arctic averaged 21ºC above their long term mean. Permafrost is no longer looking so permanent and some now call it "tempfrost". As it melts, not only are roads and buildings sinking and breaking, but it is releasing more and more of the methane and carbon dioxide that have been locked away for millennia and which will, of course, only make the melting worse.

If the Arctic isn't pristine, then perhaps the mountains, the high Andes and towering Himalayas? Well, again, you're probably aware of the accelerating glacier melt occurring on 95% of all glaciers, including the most remote. And in many places the melt is accelerated when soot particles land from cooking fires and factories land on the ice, darkening the surface and absorbing more solar energy. Indeed, thanks to Julian Assange, we know that the US State Department was told by the Dalai Lama that addressing climate change is a higher priority for Tibet than independence from China.

What about the deep Amazonian rainforest where there are still to this day dozens of uncontacted tribes? Yet first contact for these indigenous groups is most likely to be with loggers. Although deforestation rates have declined from a decade ago, tropical rainforests continue to be bulldozed at a rate of a football field every few seconds. Eighty percent of the world's ancient forests have been destroyed or degraded, half of that has been in the last 30 years.

What about bottom of the ocean? Even there the human fingerprints are everywhere. Deep sea trawling by commercial fishing fleets drags heavy metal beams over the sea floor, crushing and scattering slow-growing deep corals and other creatures and kicking up plumes of underwater dust that can be seen by satellites. And each year, an area twice the size of the continental United States is bottom trawled, scooping up more fish than the ocean can replenish. Four-fifths of commercial fish species are considered by marine biologists to be fully-exploited, over-exploited or have collapsed. On our current trajectory, no commercially-viable fish stocks will be left by the time my daughter turns 40.

Feeling stressed? Breathe in – breathe out – breathe in – breathe out. Every second breath comes from phytoplankton, microscopic plant-like organisms in the oceans that are the basis of the marine food chain and which are the source of over half the planet's oxygen. And yet, there is evidence that the number of phytoplankton has declined by 40% since 1950. I've already alluded to climate change, but did you know that all the excess carbon dioxide in the atmosphere is also changing the chemistry of the oceans? The planet's oceans are on average 30% more acidic than pre-industrial times, more acidic than they have been for millions of years and changing faster than any known previous shift. And they are getting warmer too. Climate change is first and foremost oceanic change, since oceans absorb more than 93% of the extra energy trapped by our greenhouse gas pollution. Oceanic currents are shifting. Sea levels are rising. The climate is warming: 2010 was the equal warmest year at the end of the warmest decade, which followed the previous warmest decade, which followed the previous warmest decade on record. The last 311 consecutive months have all been warmer than the 20thC average.

Seasons are changing. Plants flowering earlier in Spring, migrations and hibernations patterns are shifting. Our actions are shifting rainfall patterns: stronger droughts, more intense rain and snow.

Human actions are responsible for the extinction of about a thousand recorded species. They are just the ones we're aware of. Our best estimates of how many we've actually bumped off falls between twenty thousand and two million. And this is rising rapidly, causing most biologists to judge that we are currently causing the start of the sixth great extinction event in earth's four and a half billion year history.

Since 1970 we have reduced animal populations by 30%, the area of mangroves and sea grasses by 20%, the coverage of living corals by 40% and large African mammals by more than 60%.

Over 60% of major rivers in the world are dammed or diverted. There is five times as much water stored in dams and reservoirs as all the world's rivers put together. We have directly modified three quarters of the ice-free land surface of the planet and currently move more soil each year than the natural cycles of wind and water.

And I haven’t mentioned heavy metal toxins, soil degradation, aquifer depletion, ocean eutrophification, introduced species, desertification, or the trillions of floating plastic particles found in all the world's oceans.

We no longer live on the same planet on which we were born.

And God said to them, "Be fruitful and multiply, and fill the earth and subdue it; and have dominion over the fish of the sea. And over the birds of the air and over every living thing that moves upon the earth."

- Genesis 1.28 (NRSV).

Our passage this morning has been used to justify the patterns of exploitation and acquisition that in our lifetimes have reached such an extent as to have permanently altered the face of the planet. Can we read it again with fresh eyes and see whether it might have good news for us today?
I haven't had time to include links for all these claims, though it's worth noting that they were not first published by Greenpeace or WWF; they are not the scare stories of eco-extremists out to rob you of your fun or set up a world government. These claims appear in highly respected scientific journals – Nature, Science, Proceedings of the Royal Society and so on. Some are still quite fresh and subject to ongoing debate. Most are widely agreed as our best knowledge of our present situation. If there are particular ones you are interested in, I can try to provide relevant citations.

Scraping the bottom of the barrel

Bottom trawling is a stupidly destructive form of fishing. Done by dragging huge nets weighted with heavy metallic plates across the ocean floor, such trawling leaves a trail of damage and destruction on the ocean floor in its path. It is akin to hunting for wild pigs by bulldozing the forest in which they dwell. And yet trawling is occurring at a rate 150 times faster than deforestation, damaging an area twice the size of the contiguous USA each year. Cold water and deep water corals are very slow growing, taking hundreds or thousands of years to recover from damage that can be done in a single pass of trawling nets.

The EU Council of Fisheries Ministers just passed up another opportunity to do something about this unnecessary and myopic practice.

It doesn't have to be this way.
The obvious picture to go with this post would have been something including a lot of water, but I picked this one instead. It is a hut on the island of Lindisfarne made out of half an old herring fishing boat. The herring trade used to employ thousands of people in the UK and over 30,000 boats were dedicated to the industry on the east coast alone. The industry today has been decimated, at least partly through damage caused by trawling.

Choking on coal

Washington Independent: coal related health effects cost the US $100 billion each year, including over 13,000 deaths. I imagine that even prior to considerations of climate change, if the public health effects of burning coal are taken into account, renewable energy is more affordable than such dirty combustion. Meanwhile, the head of BHP Billiton has said that Australia needs to move beyond coal. And finally, images of coal ash in China.

Independent: UK government to adapt to inevitable warming, yet without spending any more money.

Mongabay: Amazon.com vs the Amazon: paper trails and deforestation.

Deep-sea trawling damages an area twice the size of the contiguous USA each year.

And just to show that sometimes simultaneous disasters can dilute rather than amplify each other: Scientific American reports on research showing that hurricanes help save thermally-stressed coral reefs by cooling water temperatures; Skeptical Science points out that in New York, higher rainfall doesn't necessarily mean more flooding due to drier soil from higher temperatures; and NASA satellites reveal that the incidence of wildfires is no higher in dead forests killed by mountain pine beetle infestations (which have reached epidemic proportions due to warmer winters enabling more beetles to survive) since green needles of live trees are more flammable than brown needles of dead ones.

These points vaguely remind me of the story of a man who wanted to kill himself and so decided to do a thorough job. He hung himself over a lake after taking poison and brought along a gun to make sure. His shot missed his head and severed the noose, dropping him into the water which diluted the poison. Since all the other methods had failed, he decided he wanted to live after all and so swam to shore and survived. I'm not sure we're going to be so lucky.

"And the sea was no more"

Deepwater Horizon: overview of a catastrophe
The Deepwater Horizon oil rig exploded on 20th April, killing eleven workers and injuring seventeen more. The well which it had been drilling was in water over 1.5km deep and descended another few kilometres into the sea floor into an oil field estimated to contain about 50 million barrels of oil (enough to supply the world's needs for less than a day, by the way). After the explosion, oil started gushing from the well into the deep waters of the Gulf and has continued to do so until today, over one month later.

After initially claiming that the oil slick on the surface was just from the sunken rig and not from the well, BP then offered an first estimate that about 1,000 barrels a day were leaking. This was revised up to 5,000 barrels a few days later by NOAA (National Ocean and Atmospheric Administration) and has remained the official government estimate. Scientists analysing the size of the visible spill on the surface put the figure at around 20-25,000 barrels a day, though this ignored the significant amounts of dispersant that BP was pumping into the oil as it exited the well (causing much of the oil to never make it to the surface) and the enormous oil slicks, some 10 km long, floating well below the surface.

Critics of BP started to point out numerous problems in their response, including their use of inferior and more toxic dispersants purchased from a company linked to BP (they have recently been ordered to find a less toxic alternative, having already employed 3 million litres of the stuff) and perhaps of greater concern, a pattern of trying to hide or minimise the extent of the problem. Under pressure, BP finally released some video footage of the underwater oil eruption, from which independent scientists estimated the flow rate at up to 70,000 barrels per day. More pressure from Senators lead to BP posting more videos, from which it has been estimated that it may be closer to 100,000 barrels per day, of which BP have now managed to siphon off up to about 5,000 barrels per day via a pipe they have managed to thread down the gushing hole. That is, it appears that the disaster is one hundred times greater than they first admitted. It is already the largest oil contamination in US waters and is moving up the charts towards the largest in the world. About one fifth of the waters in the Gulf are now off-limits to fishing and some of the oil has been caught in the Loop Current, pulling it towards Florida and the lower eastern states.

Tony Hayward, CEO of BP has been quoted calling the 38,000 square kilometres of visible surface spill "a drop in the ocean" when compared to the enormous volume of water in the Gulf. Despite numerous apparent serious breaches of safety protocol and a history of pollution infractions from the rig, he has called the disaster "unforseeable" and "inconceivable" and assured people that the environmental damage is likely to be "very, very modest".

This is not an oil leak, which sounds slow, nor an oil spill, which implies that the oil is pouring from a tank of a given size. This is an ongoing underwater oil gusher, filling an olympic swimming pool every four hours or so. Although efforts to stem the flow are ongoing, ultimately, it may not be stopped until a relief well is drilled, which is likely take a few months. Many commentators are beginning to suggest this may turn out to be the largest environmental catastrophe in US history.

Our dying oceans
However, this is just one of a number of deeply troubling problems facing the world's oceans, and despite potentially affecting the Gulf of Mexico for years to come, its effects are dwarfed in both scale and long term impact by a range of other threats to ocean life: acidification (from carbon dioxide), plastic pollution - including a floating garbage patch possibly larger than Australia, dead zones from agricultural run-off (the oil pollution is likely to exacerbate this problem in the Gulf of Mexico), warming causing coral bleaching, thermal stratification and other changes in marine life, indiscriminately destructive fishing techniques (trawling and dredging) and overfishing, global fish catch peaked in the 1980's and on current trends all commercial fish stocks will likely be depleted (unprofitable or extinct) in the next few decades.

For the authors of holy scripture, the ocean was a terrifying chaos, filled with monsters and a symbol of destruction. The vision of the new heavens and new earth in Revelation 21 includes the telling phrase "and the sea was no more", indicating an end to chaos and destruction.

But today, the picture is reversed. Our oceans are threatened and dying. It is we who are the chaotic (or perhaps all too systematic) destroyer.