OneWorld US: Unless immediate action is taken, climate change could reverse 50 years of progress in the fight against global poverty, warns a humanitarian group calling on G8 leaders to prioritize climate change at their first in a series of meetings today. Changing temperatures worldwide are destroying harvests, causing widespread hunger, forcing people to flee their homes, driving the spread of disease, drying up crucial water supplies, and spurring a rise in disasters, says Oxfam International …