Agence France-Presse: Cambodian Prime Minister Hun Sen on Monday urged rich countries to take more responsibility for causing climate change, saying poorer nations were the ones to suffer the fall-out. “All of us poor countries do not cause climate change. (We) would like rich countries to take a bit more responsibility than before,” Hun Sen said, branding it a “sin”. Hun Sen made his remarks at the first national forum to promote understanding of climate change in Cambodia, ahead of a key global …