Without policies to protect the world’s most vulnerable from crop failure, natural disasters, waterborne diseases and other impacts of climate change, 100 million more people could sink into poverty by 2030, the World Bank said. The report unveiled yesterday is one of a growing number of high-level studies linking poverty to climate change. This one, World Bank officials said, goes further by combining findings from household surveys in 90 nations with modeling results on the impact of rising global temperatures on food prices, heat waves, floods, droughts and diseases.