July 11, 2008
UPDATE
EPA Sidesteps Regulating Greenhouse Gases
The Environmental Protection Agency on Friday delayed making a decision about whether human health and welfare are being harmed by greenhouse gas pollution. In a federal notice, the agency instead called for more public comment, essentially bumping the decision to the next administration. Associated Press reporter Dina Cappiello explains the EPA's decision and its potential impacts.

July 10, 2008
REPORT
Alaskan Village Copes With Real-life Impacts of Global Climate Change
In Shishmaref, Alaska -- a 600-person village 20 miles south of the Arctic Circle -- residents are feeling the effects of climate change: earlier sea ice melts and increasing storm surges. Tom Bearden reports on how the villagers are coping.

Audio Slide Show: Life in Shishmaref

July 9, 2008
UPDATE
Divisions Emerge on Climate Goals at G-8 Summit
Leaders of the Group of Eight industrialized nations agreed Tuesday to cut greenhouse gas emissions in half by 2050. On Wednesday, a group of five emerging economies -- Brazil, China, Mexico, India and South Africa -- refused to sign the agreement, saying they would wait until wealthier nations cut emissions more aggressively. New York Times reporter Andrew Revkin discusses the G-8 meeting.

July 8, 2008
UPDATE
G-8 OKs Plan to Halve Global Emissions by 2050
Leaders of the Group of Eight industrialized nations agreed to cut greenhouse gas emissions in half by 2050 -- an agreement lauded by the participants but rejected by some environmentalists as not significant enough.

June 6, 2008
UPDATE
Senate Republicans Block Cap-and-Trade Legislation
Republicans have blocked a final Senate vote on a bill that would have capped carbon dioxide from power plants and factories and set a target for cutting greenhouse emissions by 71 percent by mid-century. Democrats were 12 votes short of getting the 60 votes needed to end a Republican filibuster. Opponents claimed it would raise taxes and increase energy prices.

May 28, 20.08
ANALYSIS
Study: Climate Change Impacting U.S. Crops, Resources
Climate change is already affecting agriculture, water resources and biodiversity in the United States, according to a report by the U.S. Climate Change Science Program. The report found that global warming has led to more forest fires, crop failure, invasive weeds and insects, droughts in the arid West, and other problems.

March 28, 2008
REPORT
After Major Cyclone, Bangladesh Worries About Climate Change
Months after Cyclone Sidr killed 3,200 people along the Bangladesh coast, the devastated country turns its attention to climate change. Fred de Sam Lazaro reports on recovery efforts and worries about the long-term future of the country.

March 6, 2008
REPORT
Carbon Offset Plans Allow Businesses to Trade Environmental 'Credit'
As more businesses and individuals aim to reduce their carbon emissions, a market is growing for carbon offsets that allow them to do so by investing in "green" technologies.

March 6, 2008
FORUM
Experts Answer Questions on Carbon Offsets
The carbon offset market is growing, spurred by businesses and consumers who want to lessen their carbon footprint by investing in ventures like hydroelectric power or forest regeneration. Two experts on carbon credits took your questions.

December 20, 2007
REPORT
EPA Decision to Block State Emissions Plans Raises Policy Debate
The Environmental Protection Agency denied new emissions proposals from California and 16 other states Wednesday that would set guidelines for automakers. Sen. Barbara Boxer, D-Calif., and a former EPA official debate who should regulate emissions.

December 17, 2007
ANALYSIS
Bali Climate Conference Ends With Compromise
The U.N. climate change conference ended in Bali Saturday with a last-minute deal that sets the terms for a new climate change treaty. The talks were described as emotional, with discontent directed toward U.S. objections to specific emissions caps. A U.S. negotiator and a climate analyst assess the talks.

November 19, 2007
ANALYSIS
U.N. Panel Warns on Climate Change in Report
The United Nations Intergovernmental Panel on Climate Change has issued its fourth and final report. The world will have to stop greenhouse gas emissions growth by 2015, and reduce emissions up to 85 percent over the next 40 years, in order to avoid the worst effects of global warming, the panel found. IPCC member Michael Oppenheimer discusses the report.

October 12, 2007
CONVERSATION
Gore, U.N. Climate Panel Share Nobel Peace Prize
Former Vice President Al Gore and the U.N. Intergovernmental Panel on Climate Change won the 2007 Nobel Prize for Peace Friday for spreading awareness of climate change and urging international action to combat global warming.

September 27, 2007
ANALYSIS
U.N., Bush Administration Sponsor Climate Talks
U. N. Secretary-General Ban Ki-Moon gathered 80 world leaders Monday at a climate summit to discuss post-Kyoto emissions rules, while the Bush administration gathered leaders from many of the world's top-polluting countries at its own meeting Thursday. Current and former U.S. climate negotiators discuss the climate talks.

May 31, 2007
UPDATE
President Bush Urges Nations to Set Emissions Targets
President Bush, in a counter-offer to European leaders, said Thursday that 15 nations with the world's largest economies should set common targets for cutting greenhouse gas emissions by the end of 2008.

May 10, 2007
CONVERSATION
Professor Touts Fossil Fuel Alternatives
The NewsHour's series of discussions about ways to deal with climate change concludes with Martin Hoffert, a New York University physicist who advocates increasing research to make alternative energy sources such as solar, wind, nuclear and biomass power more feasible and efficient.

May 4, 2007
UPDATE
U.N. Panel Outlines Plan to Reduce Global Warming
The world needs to significantly change its use of energy resources and cut greenhouse gas emissions in order to stem rising global temperatures, according to a U.N. climate report issued Friday.

Report: Intergovernmental Panel on Climate Change Working Group III executive summary (PDF)

May 2, 2007
REPORT
Physicist Searches for Alternative Fuel Technologies
Nobel Prize-winning physicist Steven Chu and his scientists at the Lawrence Berkeley National Laboratory in California work to develop clean fuel technologies, such as new kinds of solar cells and biofuels. Their efforts received a $500 million boost in February, when the energy company BP chose the laboratory to house an Energy Biosciences Institute devoted to developing biofuel technologies.

May 1, 2007
DEBATE
Author and Advocate Debate Future of Coal
The fifth part of a series about how to deal with climate change looks at the use of coal and so-called "clean coal" technologies, such as capturing carbon dioxide emissions from existing coal plants. A coal industry representative and the author of a book critical of the industry whether coal holds promise or peril for global warming efforts.

April 25, 2007
CONVERSATION
Author Says Redirect Resources Against Climate Change
In the next segment of a series about how to deal with climate change, Danish statistician Bjorn Lomborg, author of "The Skeptical Environmentalist," discusses his proposal to redirect resources from a general fight against carbon emissions to specific efforts to mitigate the effects of climate change in vulnerable areas.

April 16, 2007
UPDATE
Global Warming Poses National Security Threat, Report Finds
Global climate change could have an increasing effect on the strategic interests of the United States and will likely pose "a serious threat to America's national security," a panel of retired generals and admirals said Monday.

April 13, 2007
CONVERSATION
Author Promotes Lifestyle Changes in Global Warming Fight
The conversations about climate change continue with writer and environmentalist Bill McKibben, who discusses lifestyle changes that could reduce greenhouse gas emissions and combat global warming.

April 11, 2007
CONVERSATION
Carbon Tax Aims to Cut Greenhouse Gasses
The NewsHour's series of conversations about approaches to deal with global climate change continues with a discussion of carbon taxes -- levies that would aim to reduce greenhouse gas emissions by taxing activities that burn fossil fuels.

April 10, 2007
CONVERSATION
Experts Look to Cap-and-Trade Model to Curb Carbon Emissions
In this first in a series of conversations on ideas and approaches to deal with global warming, the NewsHour speaks with Eileen Claussen, president of the Pew Center on Global Climate Change, about cap-and-trade programs to limit carbon emissions.

April 6, 2007
REPORT
Climate Change Will Hit Poor Hardest, Panel Says
Earth's climate and ecosystems are already being affected by climate change, and future changes will hit the world's poor the hardest, according to an Intergovernmental Panel on Climate Change report released Friday. The panel approved the report after a week of sometimes contentious discussion among scientists and government officials.

April 2 , 2007
REPORT
Supreme Court Rules EPA Can Regulate Car Emissions
The Supreme Court on Monday ruled that the Environmental Protection Agency can regulate greenhouse gas emissions from cars -- a rebuke to Bush administration policy. Also Monday, the court ruled against a power utility in a Clinton-era case demanding fines for past pollution.

March 21, 2007
REPORT
Gore Urges Action on Climate Change
Former Vice President Al Gore returned to Capitol Hill Wednesday to testify about global climate change. Gore told a congressional panel that global warming is "a true planetary emergency" and urged Congress to take action. The NewsHour presents excerpts of the hearing.

February 16, 2007
REPORT
New Prospects Emerge for Emissions-Control Legislation
A confluence of factors -- including new congressional leadership, a recent U.N. report on climate change and a new sense of public urgency about global warming -- is contributing to a recent push for federal emissions-control legislation, according to several energy and environmental policy experts.

February 2, 2007
ANALYSIS
U.N. Panel Says Humans 'Very Likely' Causing Global Warming
The Intergovernmental Panel on Climate Change issued a report Friday saying temperatures and sea levels will continue to rise for centuries even if greenhouse gas emissions stabilize. An expert and a report co-author discuss the findings.

February 2, 2007
UPDATE
Humans to Blame for Global Warming, U.N. Panel Says
The evidence for global warming is "unequivocal" and it is "very likely" that human actions are to blame for rising temperatures, an international panel of climate experts said Friday. The statements are the strongest yet from the U.N. Intergovernmental Panel on Climate Change.

Report: IPCC assessment on climate change (PDF)

January 22, 2007
UPDATE
Businesses Press President Bush, Congress on Climate Change
The chief executives of 10 major organizations joined environmental watchdog groups Monday to urge President Bush and Congress to enact mandatory caps on carbon dioxide emissions, which most scientists believe contribute to global warming.

October 30, 2006
UPDATE
Global Warming Could Significantly Impact World Economy, Study Says
Unchecked global warming could impact the world economy on a scale comparable to world wars and the Great Depression, a report issued Monday by the British government says.

August 7, 2006
REPORT
Focus on Fuel Standards Increases Along with Price of Gas
As the price of oil balloons and trips to the gas pump cost more, U.S. fuel economy standards -- aimed at making vehicles more fuel-efficient -- are coming under renewed scrutiny for their impact on global warming.

Interactive: Fuel Economy and Carbon Emissions -- How Does Your Vehicle Measure Up?

Graphic: Fuel Economy -- Federal Standards vs. On-the-road Usage

August 4, 2006
ANALYSIS
Deadly Heat Wave Reignites Climate Change Debate
A front of cool air moved over the East Coast Friday, bringing an end to a record-breaking heat wave that started last week in California and is blamed for nearly 200 deaths. Climatologists discuss the debate over the Earth's changing weather.

June 22, 2006
UPDATE
Earth Warmest in 400 Years, Panel of Scientists Says
A panel of top climate scientists reported Thursday that the Earth was hotter in the last few decades of the 20th century than it has been over the last 400 years and possibly longer.

June 2006
Technologies Target Global Warming
In a three-part series, NewsHour correspondent Paul Solman explores how businesses are trying to find innovative ways to deal with global warming.

Part I: Global Warming Presents Business Opportunities

Part II: Emissions Exchange Program Aims to Reduce Greenhouse Gases

Part III: Researchers Scramble to Create CO2-Busting Technologies

April 13, 2006
Rising Gas Costs Increase Appeal of Biofuels
Rising gas prices have increased the interest in alternative fuel sources such as biodiesel made from old cooking oil and ethanol made from corn.

July 5, 2005
U.S. Faces International Pressure on Climate Policy
President Bush headed to Europe Tuesday for a three-day meeting with other industrial nations to discuss international economic issues. One of the topics on the G-8 agenda is climate change. Betty Ann Bowser of the Science Unit reports on the science and politics of climate change.

November 8, 2004
Arctic Ice Pack Reveals Warming Trend
Results of a four-year study released this week by a team of 300 scientists show the Arctic is warming at twice the global average rate. Tom Bearden reports on the science of the Arctic.

September 7, 2004
Scientists Call Air Pollution Global Problem
Air pollution is difficult to track and prevent because plumes of impurities that originate in one country can drift half a world away, ultimately affecting the climate and human health on different continents. Betty Ann Bowser looks at global efforts to overcome geopolitical hurdles in clearing the air.

May 20, 2004
Species Decline May Herald Climate Changes
Tom Bearden of the NewsHour Science Unit examines how climate change could affect large numbers of species.

April 21, 2004
Scientists Gauge Climate Change on Wildlife
As Americans mark another Earth Day, the NewsHour's Science Unit examines how relatively small climate changes due to global warming can affect small animals and plants in rainforests.