The answer to the oft-asked question of whether an event is caused by climate change is that this is the wrong question. All weather events are affected by climate change because the environment in which they occur is warmer and moister than it used to be. Changes in extremes, such as higher temperatures and increases in heavy rains and droughts are not related to climate change, they are climate change
http://www.flassbeck-economics.com/how-climate-change-is-rapidly-taking-the-planet-apart/