During hot, stagnant summer weather, cities face the difficult task of promoting both safety and environmental friendliness.

Coal has shaped America's history, but its power has come at a price. As Americans use more electricity, we keep burning more coal.

Australia's newly proposed carbon tax would be one of the most ambitious carbon plans outside of the European Union. But with the world's biggest polluters unwilling to cap their greenhouse gas emissions, many Australians are rallying against the proposed tax.

The Wallow Fire is Arizona's largest fire ever. But a new business venture could help pay to protect other forests in the Western U.S.