In this video, the citizens of Tucson, Arizona, talk about the challenges climate change poses for the city and about the "Power to Prepare Tucson" summit the city held earlier this year (2012) to address those challenges. The event, was a central part of Tucson's participation in WWF's Earth Hour City Challenge, a competition among U.S. cities to prepare for climate change and reduce carbon footprints.  

A short video introduction to WWF's Earth Hour City Challenge, a competition among U.S. cities to prepare for climate change and to shift away from fossil fuels.

In this video from the BBC, Alan Thorpe of the European Centre for Medium-Range Weather Forecasts (ECMWF) explains how declining Arctic sea ice and warming north Atlantic sea surface temperatures are contributing to shifts in the atmosphere that are disrupting summer weather in the U.K.  

Al Jazeera's Nick Clark reports from the Last Ice Area -- the northwest coast of Greenland and Canada’s High Arctic Islands -- aboard the Arctic Tern 1.  It is the first of four reports in a special series from WWF's Sailing to Siku voyage.

Al Jazeera's Nick Clark reports from Qerqertat, Greenland, the northernmost civilian community in the second of four reports  from the Last Ice Area -- the northwest coast of Greenland and Canada’s High Arctic Islands.

Al Jazeera's Nick Clark reports from the Arctic as he travels from Qaanaaq, on the west coast of Greenland, to Canada. It is the third of four reports from the Last Ice Area -- the northwest coast of Greenland and Canada’s High Arctic Islands.

Al Jazeera's Nick Clark reports from the northernmost civilian community in the fourth and final report in a special series from the Last Ice Area -- the northwest coast of Greenland and Canada’s High Arctic Islands.

When I was a kid, one of my prized possessions was a globe. No part of that globe fascinated me more than the Arctic, that amazing mass of white covering the top of the world.  But as we load the atmosphere with greenhouse gases, global warming is melting that polar ice.  On 26 August, sea ice extent had declined to 42 percent below the 1979-2000 median -- a reduction of extent equivalent to about one third of the entire land area of the United States. The globe we knew as children is disappearing before our eyes. Our politicians need to have an adult conversation  about these risks while we still have time.