USA Today: What will it take to fix climate change? The world will need new technologies that produce energy without emitting greenhouse gases, scientists argue in a study to be published Wednesday. The research looks at a popular 2004 approach put forward by two Princeton scientists who said the increase in carbon dioxide emissions could be stopped by dividing the task into seven "slices," or wedges, that use existing technologies. For example, one wedge called for doubling the use of nuclear energy and another...