Pollution

In their single-minded pursuit of economic growth, China's leaders have long overlooked public health -- which, by some measures, is now worse than under Mao. Despite recent reforms, China's citizens keep getting sicker, threatening the country's health-care system, the economy at large, and even the stability of the regime.

The world cannot let the March disaster at Japan’s Fukushima power plant scare it into forgoing the benefits of nuclear energy -- a cheap, reliable, and safe source of electricity. Still, writes a former U.S. undersecretary of energy, the United States does need to update its safety standards and reform its handling of nuclear waste.

Clean energy was supposed to create jobs while reducing energy insecurity, global warming, and the U.S. trade deficit. But Washington's policies have encouraged quick and easy projects that cannot compete with conventional carbon-based sources.

Most initiatives to slow global warming involve reducing carbon dioxide emissions. Little attention has been given to reducing emissions of the light-absorbing particles known as "black carbon" or the gases that form ozone--even though doing so would be easier and cheaper and have a more immediate effect.