The Shirt-Sleeve Solution

Casual Friday can help save the planet, says Japanese prime minister Junichiro Koizumi. Japan's "Cool Biz" campaign urges businesses to combat global warming by using less air-conditioning during the summer and letting employees doff their ties and suit jackets. (In winter, "Warm Biz" encourages workers to layer up and turn the heat down.) Last year's efforts reduced carbon dioxide emissions by 460,000 tons.