Biologists have announced many Antarctic discoveries during International Polar Year.
Oil spills foul shores in San Francisco Bay and the Black Sea.
Houses in fire-adapted habitats burned during some of the worst blazes in California history.
Under human influence, species are spreading faster than ever.
Vietnam's threatened, still-mysterious biodiversity gets a conservation connection.
The delta's levees are no match for a big earthquake.
A predator returns - and reverses decades of aspen decline.
How have humans altered Earth's land surface? See it via satellite.
Athens copes with the aftermath of a devastating fire.
Impacts from the IPCC's 2007 report.