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After cooling the eastern tropical Pacific for the second winter in a row-and teaming with other large-scale weather patterns to wreak havoc on North American winter-La Niña ended in April 2012. Researchers from the Climate Prediction Center of the U.S.

The scale of just how dry the start of 2011 has been is evident in some fascinating data from one of Europe's latest Earth observation satellites.

The scale of the rush by speculators, pension funds and global agri-businesses to acquire large areas of developing countries is far greater than previously thought, and is already leading to conflict, hunger and human rights abuses, says Oxfam.

It produces less radioactive waste and more power but it remains unproven on a commercial scale