Agence France-Presse: Commonwealth heads of state should send a strong message of support to next month’s international summit on climate change in Bali, the 53-nation group’s chairman said Friday. "There is little doubt that in order to keep the adaptation challenge in manageable bounds we must work decisively towards the aim of reducing greeenhouse gas emissions by at least 50 percent below 1990 levels, and this to be reached by 2050," said Lawrence Gonzi, outgoing chairman and Maltese prime …