成人快手

Climate experts identify man-made "tipping elements" in the climate system that could cause sudden climate changes, some taking effect in a single year. Restoring the forest environment of Madagascar's dwindling population of indri lemurs. Report that suggests biofuels can add to the problem of global warming. Controversy over the conservation of the oldest human footprints found to date, the Laetoli footprints in Tanzania. Plus, holographic display for 3D movies.