About 50,000 lives a year could be saved by 2030 if no new coal-fired power plants are built in Southeast Asia, South Korea, Japan and Taiwan, according to a study from researchers at Harvard University and Greenpeace International. If coal plants currently planned or under construction in the region are actually built, some 70,000 deaths could result annually, up from about 20,000 deaths at the moment, Greenpeace said Friday in a statement summarizing the study.