Reuters: President-elect Barack Obama, who has vowed to adopt an aggressive approach to global warming and the environment, will hold a news conference on Monday to announce his picks to lead the effort. Obama will hold a news conference at 5 p.m. EST on Monday to talk about “the nation’s energy and environmental future,” his transition office said on Sunday. At the news conference Obama is expected to name Nobel physics laureate Steven Chu as his energy secretary and former …