Unilever, the world's No. 2 maker of household and personal care products, will rely solely on renewable energy by 2030 and will stop using energy from coal by 2020. Unilever, along with Procter & Gamble and other rivals, has wet emissions targets for their businesses with the aim of limiting global warming to less than 2°C. Unilever Chief Executive Paul Polman is a leading advocate for the idea that there is a business case for sustainability even as his company's sales have...