The climate summit that opened at the United Nations on September 22 is the largest gathering of its kind.

It is seeking to break the deadlock that has prevented 190-nations from agreeing on a climate change pact.

But while world leaders wrangle, the effects of climate change are taking their toll.

Al Jazeera's Tony Birtley travelled to Tasmania, in the remote southeastern corner of Australia, to see how a temperature change of just a few degrees has made a big difference.