Superstorm Sandy a sign of things to come

Extreme weather events such as superstorm Sandy and this summer’s drought in the US will become more frequent as the climate changes.

The warning comes as countries gather this week for the latest round of UN climate talks in Qatar.

European officials and campaigners want the talks to make progress towards a new global binding treaty by 2015, which the EU and a coalition of developing countries managed to get the world to agree to negotiate last year.