All these events will be influenced to some degree by global temperatures, but it's impossible to say with certainty that any of them would not have happened in the absence of man-made global warming.

Environmentalist Mark Lynas has shown how phasing out planned nuclear programmes in a number of countries as a result of the Fukushima disaster could add another degree to global warming.

Global temperatures have already gone up one degree and begun the rapid melting of the Arctic.