Al Gore returned to Congress today to testify about global warming. He even spoke before the committee chaired by Rep. John Dingell, who hasn't exactly enlisted in the climate-change fight. John Dimsdale covered the hearings.

As energy costs and climate change made headlines in 2006, many businesses began to change their wasteful ways and adopt more sustainable practices. But it's still all about profit.

A House panel today investigated allegations against administrative officials pressuring federal scientists to keep global warming references from their research. Eric Niiler has the story from Washington.

China has a new corporate tax law for foreigners who want to do business there. Scott Tong went to Hunan Province, where business people say it's about time.

You don't have to spend a lot to lower your energy consumption. From North Carolina Public Radio, Janet Babin reports.

The U.S. is going to have trouble funding alternative energy if it waits for a carbon tax. Commentator Robert Reich says we should look to oil companies to provide the money.

The European Union wants all airlines flying in and out of its airspace to cut greenhouse gas emissions. The U.S. and other countries say that's not legal. Stephen Beard reports.

A new study says climate change could cost the world economy more than $6 trillion unless drastic, international action is taken now. The good news: The cost might be pretty reasonable. Stephen Beard reports.

A global-warming report out this week says the price of global poverty and mass migration due to climate change outweighs the costs of taking urgent steps to push back warming. Commentator Mark Hertsgaard argues a green planet and a healthy economy are actually inextricably linked.

Gas prices are up, gas prices are down — but where does that leave alternative energy technology? As Sam Eaton reports, a lot would have to change to make alternative fuels economically viable.