VIENNA, Austria - It's the business end of climate change: ensuring that the $20 trillion the world will spend on energy over the next two decades is as environmentally friendly as possible. This week's latest round of talks on global warming, which get under way in Vienna on Monday, will focus on giving governments and private investors tips and incentives to keep a lid on greenhouse gas emissions. "We need to 'climate-proof' economic growth," Yvo de Boer, the U.N.'s top climate official, told reporters Sunday. More than 1,000 delegates were gathering in the Austrian capital for discussions on advising nations,...