When people talk about catastrophic climate change, there's a fair chance that Greenland is on their mind. If they use the term 'tipping point', then it is pretty much a sure thing. One-twentieth of the world's ice is locked up atop that island, and if it were to melt completely, global sea levels would rise by seven metres. The collapse of the Greenland ice sheet is in the front rank of potential climate catastrophes.

Earth Day is a week away, so brace yourself for cuddly, hug-the-planet blubbering from the presidential candidates. John McCain will tell you we must be the "caretakers of creation." Hillary Clinton will talk of recycling and efficient light bulbs. Barack Obama will surely tell us we "cannot afford more of the same timid politics when the future of our planet is at stake."

Nuke power generation trump card in fighting global warming: Fukuda Tuesday 15th April, 02:19 PM JST

The sceptical literature on global warming is tiny and, to put it generously, of variable quality. Dissent from the received wisdom that climate change is a global emergency that calls for drastic remedies has been overwhelmed. The climate-science establishment is on board; so is the larger scientific community; and so, lately, are most governments, with Britain's leading the way.

Donald Rumsfeld, the former US Secretary of Defense, liked to distinguish between "known unknowns" and "unknown unknowns", and for this he was widely ridiculed. But Rumsfeld had a point. We all know, for instance, that global warming is harming cold-adapted species on mountain tops, even if we can't predict the ultimate magnitude of the damage. Yet the really alarming changes are those that come completely out of the blue - the unknown unknowns that we never even imagined.

Greenpeace Warns On Canada's Northern Forests CANADA: April 11, 2008 VANCOUVER - Greenpeace warned on Thursday that Canada's logging practices threaten to turn the country's vast northern forest into a source of global warming, but the forestry industry says it is already taking steps to fight climate change. Logging and other development in the boreal forest release the carbon that the trees have trapped from the atmosphere over decades, potentially producing more greenhouse gases than from burning fossil fuels, the environmental group charged in a new report.

Canada Logging May Ignite 'Carbon Bomb' - Greenpeace CANADA: April 11, 2008 VANCOUVER - Canada threatens to ignite a "carbon bomb" that could drastically worsen global warming if it continues heavy logging in areas of its vast northern forest, Greenpeace warned in a report on Thursday. Logging and other developments in the boreal forest release the carbon that the trees have trapped from the atmosphere over decades, potentially producing more greenhouse gases than from burning fossil fuels, the environmental group charged.

Next US President Urged To Outline Climate Policy NORWAY: April 10, 2008 OSLO - The next US president should signal a shift in global warming policies before taking office to help a UN meeting in Poland in December take steps to work out a new climate treaty, Poland said on Wednesday. Under President George W. Bush, the United States is the only rich nation opposed to the UN's Kyoto Protocol capping greenhouse gas emissions until 2012. Many nations expect a shift under Bush's successor, whether a Democrat or a Republican.

Warming Trends Rise In Large Ocean Areas

Citizen scientists' record warming data , USA TODAY Project BudBurst, a national field campaign for "citizen scientists," is designed to help record how the planet is warming by tracking the dates that 60 plant species leaf and flower this spring and summer. Climate change is about more than endangered polar bears in the Arctic or melting ice sheets in the Antarctic. The flowers and plants in your own backyard or neighborhood park also may have a role in this global drama.

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