WASHINGTON — Humanity would need five Earths to produce the resources needed if everyone lived as profligately as Americans, according to a report issued Tuesday. As it is, humanity each year uses resources equivalent to nearly one-and-a-half Earths to meet its needs, said the report by Global Footprint Network, an international think tank. "We are demanding nature's services -- using resources and creating CO2 emissions -- at a rate...

A European satellite is set to provide major new insights into how water is cycled around the Earth. The Smos spacecraft will make the first global maps of the amount of moisture held in soils and of the quantity of salts dissolved in the oceans. The data will have wide uses but should improve weather forecasts and warnings of extreme events, such as floods. Miras will measure changes in the wetness of the land and in the salinity of seawater by observing variations in the natural ...

Earth’s atmosphere isn’t the only victim of burning fossil fuels. About a quarter of all carbon dioxide emissions are absorbed by the earth’s oceans, where they’re having an impact that’s just starting to be understood. Leading scientific experts believe that it’s possible to cut back on global warming pollution, improve the overall health and durability of our oceans, and prevent serious harm to our world—but only if action is taken quickly and decisively.