Brazil mulls major climate action

If adopted, the move would put the country ahead of other developing nations on emissions curbs.

The melting snows of Kilimanjaro

Glaciers crowning Africa’s tallest mountain could disappear within decades.

Native American culture sowed seeds of its own collapse

Floods brought the Nazca to their knees — but they crippled themselves by over-farming first.

California stem-cell grants awarded

First major round of research targeted at therapies takes off.

Satellite launches to track the world’s water

Soil moisture and ocean salinity set to be monitored from space.

Lions’ taste for human flesh dissected

Two maneaters devoured dozens in the late nineteenth century but one ate the lion’s share.