PEOPLE

摘要

US Environmental Protection Agency (EPA) administrator Lisa Jackson will step down early this year after four years in the job, she announced on 27 December. Jackson championed tighter pollution standards and worked to rein in greenhouse-gas emissions. It is unclear who will take over her position, but deputy EPA administrator Robert Perciasepe is likely to step in until the next appointee is approved. See go.nature.com/ jzaiyn for more.