Earth2011 review: The year in environment Explore the biggest environment stories of 2011, including: the Japanese megaquake, Earth's ticking time bombs, and the first field tests of geoengineering ¿ìè¶ÌÊÓÆµ
EarthUS pollution rules could save $280 billion a year Money saved from health gains should outweigh the costs of implementing the US Environmental Protection Agency's cross-state air pollution rules ¿ìè¶ÌÊÓÆµ