Reuters: Farmers want a special deal in global climate negotiations to make sure they are not saddled with excessive costs for curbing Greenhouse gas emissions, the head of the world’s leading farming lobby said on Tuesday. Agriculture is responsible for up to 20 percent of global Greenhouse gas emissions, blamed for global warming, but farmers were limited in how much they could cut emissions, International Federation of Agricultural Producers president Ajay Vashee said. Vashee, who’s …