The U.K.'s Gordon Brown, widely thought to be a leading candidate for Labour party leader (and thus potentially for prime minister), is planning on making the environment and sustainability centerpieces of his position:

Gordon Brown will stake his claim to be Britain's next prime minister today by promising to mould a progressive centre ground in which the fight against "the environmental degradation of the planet" will form the pivotal element of his vision of a "good society". ..."The environmental degradation of the planet is the biggest threat to our achievement of justice. It threatens all our ways of life, and the poorest will suffer most."