On Our Radar: A Yosemite Valley, Restored? Voters in San Francisco will vote next month on a proposal to commission an $8 million study on the possibility of draining the Hetch Hetchy Reservoir in Yosemite National Park and turning it back into a second Yosemite Valley with green meadows, rich forests and waterfalls. Scientists suggest that it can be done. The Contra Costa Times With demand for reactors quite low in the United States, the nation's nuclear power industry seeks a relaxation of export restrictions so it can sell equipment and technology to countries including China and Russia. Bloomberg Businessweek A study suggests that estimates of the power of the world's carbon sinks -- oceans and forests, mainly -- are significantly inflated. Nature The winners of NASA's "extreme weather" photo contest.