The world's leading climate research centres say 2010 is the hottest year since record keeping began 130 years ago. Scientists in dozens of countries have also concluded that the past ten years were the warmest ever.

The floods in Pakistan and landslides in China that killed hundreds of people as well as the break-up of a 260-square kilometre chunk of ice in the Arctic are reinforcing beliefs that climate change is accelerating and causing extreme weather and natural disasters.

On Thursday's Riz Khan we ask: Are we reaching the tipping point in the fight against global warming?

Joining the show will be extreme cold-water swimmer and environmental activist Lewis Pugh who swam in the icy waters of the North Pole and in a freezing Himalayan lake - to draw attention to melting glaciers from rising temperatures.

You can join the conversation. Call in with your questions and comments at our live time of 1630GMT. Repeats air at 2130GMT, and the next day at 0230GMT and 1130GMT.

Source: Al Jazeera