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....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 global warming to less than 2 degrees Celsius..."If we don’t tackle climate change we won’t achieve economic growth. This is an issue for all businesses, not just Unilever. We all have to act," Polman, who will attend the talks in Paris, said in a statement...Under targets set in 2010, Unilever said it aimed to be eventually wholly powered by renewable energy, setting an interim target for renewables to meet 40 percent of its energy needs by 2020. It is now raising the 2020 target to 50 percent and aiming for 100 percent by 2030, up from 28 percent in 2014...Unilever says it has saved over 400 million euros ($424 million) through eco-friendly measures taken at its factories since 2008 and says its brands that most fully embrace sustainability - such as Dove, Lifebuoy, Ben & Jerry’s and Comfort - perform the best...