Mexican President Felipe Calderon signed national climate change legislation into law June 5. The world’s 12th largest carbon emitter now becomes the second nation to include binding emission reductions targets in its climate change policy. The law sets targets to reduce national emissions by 30 percent in 2020 and 50 percent by 2050 and requires 35 percent of the nation’s energy to come from renewable sources by 2024 while allowing for a national emissions trading scheme. The legislature approved the measures in April, with a unanimous vote in the Senate.