Carbon pollution levels are rising so fast that the world has no realistic chance of hitting ambitious climate targets set by Britain and the G8, an influential report to the Australian government has warned.

The Garnaut report says developed nations including Britain, the United States and Australia would have to slash carbon dioxide emissions by 5% each year over the next decade to hit the 450ppm target. Britain's climate change bill, the most ambitious of its kind in the world, calls for reductions of about 3% each year to 2050.

Friends of the Earth said: "A target of 550ppm of carbon dioxide is a recipe for disaster and even the lower target of 450ppm will mean we will face runaway climate change. The Arctic sea ice and Himalaya glaciers are already disappearing and the permafrost bomb is looming. We need much deeper cuts. Professor Garnaut has described strong targets as delusional, but he continues to feed a delusional policy debate that recognises the problem but doesn't want to implement the solution."

As I report on climate change, I come across a lot of scary facts, like the possibility that thawing permafrost in Siberia could release gigatons of carbon dioxide into the atmosphere, or the risk that Greenland could pass a tipping point and begin to melt rapidly. But one of the most frightening studies I've read recently had nothing to do with icebergs or megadroughts. In a paper that came out Oct. 23 in Science, John Sterman — a professor at Massachusetts Institute of Technology's (MIT) Sloan School of Management — wrote about asking 212 MIT grad students to give a rough idea how much governments need to reduce global greenhouse gas emissions to eventually stop the increase in the concentration of carbon in the atmosphere. These students had training in science, technology, mathematics and economics at one of the best schools in the world — they are probably a lot smarter than you or me. Yet 84% of Sterman's subjects got his problem wrong, greatly underestimating the degree to which greenhouse gas emissions need to fall. When the MIT kids can't figure out climate change, what are the odds that the broader public will?

No corner of the Earth is immune from the effects of global warming, according to a new study that confirms manmade temperature rises in both the Arctic and Antarctic regions. Temperature records over the last century show that warming in the planet's coldest and most remote wildernesses is caused by human emissions of greenhouse gases.

The study, published today in Nature Geoscience, is the first to find the fingerprints of manmade global warming on the Antarctic, where a shortage of data makes it hard to be sure. Last year's report, from the Intergovernmental Panel on Climate Change (IPCC), said human influence could be detected on every continent, except Antarctica. Climate sceptics have exploited this omission to question the science of global warming.

Consumerism is the biggest obstacle to sustainability and the pressure to consume is stoked by greater inequality. Inequality amplifies social status differences and adds to status insecurity and competition. People in more unequal societies struggle to keep up: they work longer hours, borrow more and save less.

Fairness is also key to policies to reduce global warming. Allowing rich nations or individuals to produce 10 times the carbon emissions of the poor is not a basis for agreement and effective enforcement.

Seven Puget Sound killer whales are missing and feared dead in what could be the biggest decline among the sound's orcas in nearly a decade, say scientists who carefully track the endangered animals.

"This is a disaster," Ken Balcomb, a senior scientist at the Center for Whale Research on San Juan Island, said Friday. "The population drop is worse than the stock market."

While the official census won't be completed until December, the number of live "southern resident" orcas now stands at 83.

New research by the Wildlife Conservation Society and Save the Elephants has found that African Elephants are quickly becoming trapped by new road construction cutting through their forest habitats.

The study, which appeared in today’s issue of Public Library of Science, says the elephants have adopted a “siege mentality” and literally cannot bring themselves to cross roadways, even in search of food.

“Forest elephants are basically living in fear of their lives in prisons created by roads. They are roaming around the woods like frightened mice rather than tranquil formidable giants of their forest realm,” said Dr. Stephen Blake, the study’s lead author.