The Observer, Sunday 15th February:
A year ago, I wrote to Gordon Brown asking him to place a moratorium on new coal-fired power plants in Britain. I have asked the same of Angela Merkel, Barack Obama, Kevin Rudd and other leaders. The reason is this – coal is the single greatest threat to civilisation and all life on our planet.
The climate is nearing tipping points. Changes are beginning to appear and there is a potential for explosive changes, effects that would be irreversible, if we do not rapidly slow fossil-fuel emissions over the next few decades. As Arctic sea ice melts, the darker ocean absorbs more sunlight and speeds melting. As the tundra melts, methane, a strong greenhouse gas, is released, causing more warming. As species are exterminated by shifting climate zones, ecosystems can collapse, destroying more species.
The public, buffeted by weather fluctuations and economic turmoil, has little time to analyse decadal changes. How can people be expected to evaluate and filter out advice emanating from those pushing special interests? How can people distinguish between top-notch science and pseudo-science?
Those who lead us have no excuse – they are elected to guide, to protect the public and its best interests. They have at their disposal the best scientific organisations in the world, such as the Royal Society and the US National Academy of Sciences. Only in the past few years did the science crystallise, revealing the urgency. Our planet is in peril. If we do not change course, we’ll hand our children a situation that is out of their control. One ecological collapse will lead to another, in amplifying feedbacks.
The amount of carbon dioxide in the air has already risen to a dangerous level. The pre-industrial carbon dioxide amount was 280 parts per million (ppm). Humans, by burning coal, oil and gas, have increased this to 385 ppm; it continues to grow by about 2 ppm per year.
Earth, with its four-kilometre-deep oceans, responds only slowly to changes of carbon dioxide. So the climate will continue to change, even if we make maximum effort to slow the growth of carbon dioxide. Arctic sea ice will melt away in the summer season within the next few decades. Mountain glaciers, providing fresh water for rivers that supply hundreds of millions of people, will disappear – practically all of the glaciers could be gone within 50 years – if carbon dioxide continues to increase at current rates. Coral reefs, harbouring a quarter of ocean species, are threatened.
The greatest danger hanging over our children and grandchildren is initiation of changes that will be irreversible on any time scale that humans can imagine. If coastal ice shelves buttressing the west Antarctic ice sheet continue to disintegrate, the sheet could disgorge into the ocean, raising sea levels by several metres in a century. Such rates of sea level change have occurred many times in Earth’s history in response to global warming rates no higher than those of the past 30 years. Almost half of the world’s great cities are located on coastlines.
The most threatening change, from my perspective, is extermination of species. Several times in Earth’s history, rapid global warming occurred, apparently spurred by amplifying feedbacks. In each case, more than half of plant and animal species became extinct. New species came into being over tens and hundreds of thousands of years. But these are time scales and generations that we cannot imagine. If we drive our fellow species to extinction, we will leave a far more desolate planet for our descendants than the world we inherited from our elders.
Clearly, if we burn all fossil fuels, we will destroy the planet we know. Carbon dioxide would increase to 500 ppm or more. We would set the planet on a course to the ice-free state, with sea level 75 metres higher. Climatic disasters would occur continually. The tragedy of the situation, if we do not wake up in time, is that the changes that must be made to stabilise the atmosphere and climate make sense for other reasons. They would produce a healthier atmosphere, improved agricultural productivity, clean water and an ocean providing fish that are safe to eat. (Read more)
I wrote the following in an email to Ove and another contributor to this blog, Jez Roff, about this post and I thought it might be informative to let other’s see some of the rationale for a post like this on Climate Shifts:
I like the way that Ove has placed the story about Hansen’s letter as a long quote without commentary on the Climate Shifts website. The Guardian story was well written, topical and consistent with Climate Shifts’ objectives of providing “topical commentary regarding climate change, natural ecosystems, politics and the environment.” The commentary does not have to be ours – quoting the comments of people like Hansen is fine too.
Having said that, I should also point out that I rarely cite Hansen in my own publications elsewhere. In that sense I am “wary” of citing Hansen …
While I greatly respect Hansen’s work, I am wary of citing him when I write about climate change simply because I am not a climate scientist and I regard it as “cherry picking” to cite his work without reviewing the climate science literature in detail. I try to stick with the leading synthesis reports of the IPCC, CSIRO, and, in the case of coral reefs, GBRMPA.
Climate Shifts, however, is about topical commentary and I think it is good to inform more people about articles like the one in the Guardian.
Thanks for drawing the Guardian article to my attention Ove and for blogging on it.