Scientists have gone to the Antarctic to see whether iron can help to avert climate change. The theory that iron can affect marine productivity was first put forward in the 1920s. If it is right, it could have several significant consequences.

Dedicated to protecting the sky from global warming by building a private sector mechanism for reducing carbon emissions.

A new theory on the cause of global warming: increased CO2, due to decreased phytoplankton, due to centuries of fishing. A serious proposal to reverse the trend by scattering food "scraps" in the ocean.