I was at the National Gallery last night and saw this ice sculpture outside the main entrance on Trafalgar Square. The sculpture is in the shape of a polar bear and as it thaws it reveals the underlying skeleton of this endangered animal.

I think the sculpture, sponsored by the WWF and M&S, is a simple but very powerful way of getting the message across regarding climate change and global warming.

http://www.wwf.org.uk/what_we_do/tackling_climate_change/the_london_ice_bear.cfm