Washington Post: Vegetables, including broccoli, white onions and carrots, are displayed for sale on a fruit and vegetable stall at a market in Guildford, U.K., on Friday, Dec. 14, 2012. Photographer: Simon Dawson/Bloomberg The effects of climate change on food production around the world could lead to more than 500,000 deaths by the year 2050, according to a grim new study. Climate-related impacts on agriculture could lead to an overall global decline in food availability, the research suggests, forcing people...