California begins risky war on global warming today. A landmark global warming law that Gov. Arnold Schwarzenegger is scheduled to sign today commits California to the ambitious goal of cutting greenhouse gas emissions 25 percent by 2020. [News Source]

Schwarzenegger signs bills on carbon emissions. A day before he signs a landmark bill mandating cuts in industrial greenhouse emissions, California Gov. Arnold Schwarzenegger signed three bills on Tuesday also aimed at curtailing pollution contributing to global warming. [News Source]

State to challenge World. A landmark global warming law that California Gov. Arnold Schwarzenegger is scheduled to sign today on Treasure Island commits California to the ambitious goal of cutting greenhouse gas emissions 25 percent by 2020. [News Source]

Trial set to challenge Calif. car emission rules. A U.S. federal judge has ruled that automakers can move ahead with a lawsuit that challenges California's strict regulations limiting greenhouse gas emissions from cars and trucks. [News Source]

Report targets oil-sector emissions. Canada's Auditor-General's office will recommend this week that the Conservative government introduce tough new measures to fight global warming. [News Source]

Lawsuit on auto emissions advances. General Motors Corp., Toyota Motor Corp., Ford Motor Co. and other automakers have won a court bid to challenge California rules limiting tailpipe emissions linked to global warming. [News Source]

Earth at warmest point in 12,000 years, say scientists. The globe is at its warmest in the past 12,000 years, triggering environmental changes that could become "dangerous" if it continues, says a new NASA study. [News Source]

Germany to put global warming back on G8 agenda. Germany will make fighting climate change a top priority when it takes control of the G8 next year and will try to persuade the United States of its importance. [News Source]

Wisconsin group says global warming is cause for concern. Temperatures throughout Wisconsin are on the rise and global warming is to blame, according to a report released by the advocacy group Wisconsin P.I.R.G. [News Source]

Antarctic ozone hole one of the biggest. Super-cold temperatures that may be a further indicator of global warming have helped produce an Antarctic ozone hole this year that rivals the largest. [News Source]

U.S. industries lag behind in trapping carbon.

One way to manage global warming is to reduce or at least control the emission of carbon dioxide, one of the major greenhouse gases, by trapping it in vegetation or certain geological formations.