climate change

Science, Tech & Environment

Melting Arctic sea ice doubles the chances of harsh winters in other parts of the world

When most people hear the term "global warming," they naturally think of air temperature. In reality, more than 90 percent of the warming caused by greenhouse gases happens in the oceans. Much of this warming takes place in the waters in and around the Arctic Ocean, leading to increasingly rapid melting of sea ice. A new study links this melting to cold, harsh winters that are becoming more common in parts of the world.

Science, Tech & Environment

Storm expert says climate change may have played a big role in Typhoon Haiyan after all

Atmospheric scientist and tropical storm expert Kerry Emanuel has taken a deeper look at the possible influence of climate change on supertyphoon Haiyan, and has found that global warming may have had a good deal more to do with the storm's intensity than he originally thought.

Conflict & Justice

Rethinking biofuels in Europe

Biofuels have been touted as the best hope for reducing reliance on fossil fuels and limiting greenhouse gases. Now many scientists are raising doubts about that. Reporter Kathleen Schalch examines the debate over the costs and benefits of biofuels.

Global Politics

Arctic warming

Arctic temperatures in the 1990s reached their warmest level in at least 2,000 years A new study being published in Science Magazine concludes that cooling was reversed because of increased emissions of green house gases. The World's Katy Clark reports.