Agence France-Presse: Canadian Prime Minister Stephen Harper came under fire for his record on fighting global warming in a political debate televised Wednesday ahead of elections on October 14. Former environmental activist and Liberal leader Stephane Dion accused Harper of stalling on climate change since coming to power in January 2006 and tarnishing Canada’s reputation in this area. “We were heroes against climate change” under the Liberal’s steerage, Dion said. Canada had agreed under …