Offshore wind developments are rapidly expanding. But most wind turbines are not built to withstand a direct hit from the strongest hurricanes, according to a new study.

By Roni Dengler

In a report from Brazil, Margaret Warner examines how the country is pursuing deepwater oil drilling even as the Gulf of Mexico spill raises new environmental concerns about the risks involved.

In the last installment of a series on climate change, a New York University physics professor who advocates carbon-free energy explains his perspective on wind power, solar fission and other technologies.