Canwest News Service: A tiny island nation in the Pacific Ocean – that could be wiped off the map because of global warming – is seeking to to set an example for the world by shedding its dependency on oil and becoming powered entirely by renewable energy sources. Tuvalu is a Polynesian island nation located midway between Hawaii and Australia. It is made up of four reef islands and five atolls, with the highest elevation a little over four metres above sea level. The doomed archipelago is the …