Nobel Prize-winning economists and scientists will deliver a letter to the U.S. Senate today, urging lawmakers to require immediate cuts in global warming emissions.

Today’s announcement by the United Nations and the Intergovernmental Panel on Climate Change (IPCC) that the InterAcademy Council (IAC) will review the IPCC’s “processes and procedures” for its science assessments was welcomed by the Union of Concerned Scientists (UCS).

On March 9, 2009, President Obama announced his administration would restore scientific integrity to federal policymaking and gave his science adviser, John Holdren, 120 days to come up with a plan; a year later, the White House’s Office of Science and Technology Policy (OSTP) is still silent on the issue.

Conservationist Stuart Pimm, a long-time Union of Concerned Scientists board member, today was named the winner of the 2010 Tyler Prize for Environmental Achievement.

Two Texas-based oil companies are funding an effort that attempts to cast doubt on the economic benefits California's landmark global warming bill, AB 32. A March 4 letter from legislative analyst Mac Taylor to California State Sen. Dave Cogdill (R-Modesto) fails to cite any research to support his claims that the state’s economy would suffer under AB 32.

News stories focusing on errors in the Intergovernmental Panel on Climate Change’s (IPCC) 2007 report and stolen emails from climate scientists could do more to put climate change science in context.

The U.S. will retire its nuclear-armed Tomahawk cruise missiles, putting an end to the debate within the Obama administration over the future of these weapons

Court challenges against the EPA are based on disingenuous, uninformed attacks against climate science.

U.N. Framework Convention on Climate Change Executive Secretary Yvo de Boer announced today that he is resigning his position as of July 1.

The Obama administration is expected to make final decisions about the Nuclear Posture Review, the official policy document that will define U.S. nuclear weapons policy for the next five to 10 years.

Missouri's House and Senate held hearings today on nonbinding resolutions urging EPA and the state's federal congressional delegation to take a number of steps that would lock Missouri into decades of dirty energy use, stymie the state’s burgeoning clean energy industry, and undermine science in government decisions that affect public health.

Climate science contrarians are twisting a statement by Phil Jones, director of the University of East Anglia’s Climatic Research Unit, made during a British Broadcasting Corporation (BBC) interview.

UCS estimates 70 percent of antibiotics used annually are fed to food animals that aren't sick.

Over the last few months, the Intergovernmental Panel on Climate Change (IPCC) has been attacked for minor errors in its sprawling 2007 report on climate change. To set the record straight and provide appropriate scientific context, the Union of Concerned Scientists has assembled a series of explanatory backgrounders on specific allegations about the report.

Organizations representing more than 1 million Americans sent a letter to President Obama, urging him to “put an end to Cold War thinking” and “reduce the role of nuclear weapons in our national security strategy.”

Study shows combining a carbon cap with strong efficiency and renewable energy standards a cost-effective way to transition to the clean energy economy everyone agrees we need.

For years, Oklahoma Sen. James Inhofe’s office and other climate contrarians have been misrepresenting the work of Mojib Latif, a meteorologist and oceanographer at the Leibniz-Institute for Maritime Sciences in Kiel, Germany, despite Latif’s repeated attempts to correct their misinterpretations.

EPA new rules for the Renewable Fuel Standard, the nation’s primary biofuels program, got a favorable review from UCS

An administrative panel at Pennsylvania State University has cleared (pdf) Professor of meteorology Michael Mann of wrongdoing in the controversy over stolen climate scientists emails from Great Britain’s University of East Anglia Climatic Research Unit. Mann also issued a statement in which he said: “This is very much the vindication I expected since I am confident I have done nothing wrong.

Skelton-Emerson-Peterson bill would block EPA from regulating global warming emissions under the Clean Air Act.