Obama said the G-8 targets and work with developing countries are intended to support the international climate change treaty that will succeed the Kyoto Protocol in 2012 . U.S. President Barack Obama : Leaders will work together on climate change . At Italy summit , leaders pledge to slash greenhouse gas emissions . Leaders will aim to achieve a 50 percent reduction in global emissions by 2050 . Meeting took place in heart of quake zone where about 300 people died .
U.S. President Barack Obama : Leaders will work together on climate change . At Italy summit , leaders pledge to slash greenhouse gas emissions . Leaders will aim to achieve a 50 percent reduction in global emissions by 2050 . Meeting took place in heart of quake zone where about 300 people died .