Agence France Presse: Australia will end years of chilly isolation on climate change when its ratification of the Kyoto Protocol comes into force Tuesday but remains one of the world’s worst polluters for its size, analysts say. Prime Minister Kevin Rudd signed the Kyoto Protocol in his first official act following the election of his centre-left Labor government in November, after his conservative predecessor John Howard refused for more than a decade. Joining Kyoto has been hailed as an important …