Reuters: Consumer goods maker Unilever said it would switch to using only renewable energy by 2030 and would stop using energy from coal by 2020, as businesses jostle to highlight their green credentials ahead of a global climate summit. World leaders were set to meet in Paris from Nov. 30 to Dec. 11 to agree on a plan to curb global warming. Unilever was among 81 companies, along with rivals Nestle and Procter & Gamble, that have signed up to set emissions targets for their businesses with the aim of limiting...