The original e-mails, released in 2009, sowed doubts about scientists’ research and integrity and galvanized skeptics of global warming.

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New Speculation on Who Leaked Climate-Change E-Mails

Facing political hostility and lacking adequate financing, scientists are struggling to report on the causes of a concentrated span of extreme weather in the United States.

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News Analysis: Climate Scientists Hampered in Study of 2011 Extremes

People who crave a cause often have selective hearing, and this is particularly true in the current debate about global warming, writes Lisa Jardine.

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Climate change and craving a cause

Experts worry that if the permafrost thaws in the Northern Hemisphere, huge amounts of carbon will be released into the air, greatly intensifying global warming.

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Temperature Rising: Warming Arctic Permafrost Fuels Climate Change Worries

More than 190 nations agreed to work toward a treaty that would require all countries to reduce emissions that contribute to global warming.

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U.N. Climate Talks End With Deal for New Emissions Treaty

Agreement on new measures to combat global warming appears within reach at the UN climate talks in South Africa, but time is running short.

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Time runs short for climate deal

Todd S. Stern faced criticism from fellow envoys, activists and one impassioned heckler, Abigail Borah, a student at Middlebury College, over what they saw as foot dragging.

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U.S. Climate Envoy Seems to Shift Position on Timetable for New International Talks

Global emissions of carbon dioxide from fossil-fuel burning jumped by 5.9 percent, upending the notion that a decline during the recession might persist.

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Record Jump in Carbon Emissions in 2010, Study Finds

Chinese climate negotiators raised the prospect of negotiating a legally binding climate pact at U.N. talks this weekend in South Africa, but the requirements they laid out for reaching that goal might make such a deal hard to reach. In separate remarks to reporters and non-governmental groups, two of China’s top climate officials suggested they might participate in talks aimed at forging a new, enforceable global warming agreement by 2020. That issue, along with the question of whether industrialized countries will agree to a new set of emissions reductions under an existing 1997 climate treaty, are key stumbling blocks in the ongoing climate talks in the coastal city of Durban. Read full article > >

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Chinese climate negotiators raise possibility of global warming pact by 2020

New research shows the challenges ministers face in trying to curb global warming at the UN climate talks in Durban.

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UN climate talks face challenges

The report predicted that certain types of weather extremes will grow more numerous and more intense as human-induced global warming proceeds in coming decades.

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U.N. Panel Finds Climate Change Behind Some Extreme Weather Events

President Obama said Tuesday that he will decide whether to approve or deny a permit for a controversial 1,700-mile Canadian oil pipeline , rather than delegating the decision to the State Department. The proposal by the firm TransCanada to ship crude extracted from a region in Alberta called the “oil sands” to Gulf Coast refineries has become a charged political issue for the White House. Labor unions and business groups argue that it would create thousands of jobs in the midst of an economic downturn. Environmentalists — who plan to ring the White House in a protest on Sunday — say the extraction of the oil will accelerate global warming and the pipeline itself could spill, polluting waterways and causing severe environmental harm. Read full article > >

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Obama to make decision on controversial oil pipeline

An environmental group is breaking a taboo by directly tying population growth to environmental problems.

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Environmental Group Breaks the Silence on Population Control

Even as other countries take action, the issue is fading from the American agenda.

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News Analysis: Whatever Happened to Global Warming?

Trees, natural carbon sponges, help keep heat-trapping carbon dioxide out of the atmosphere. But insect and human threats are taking a heavy toll on them.

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Temperature Rising: With Deaths of Forests, a Loss of Crucial Climate Protectors