Nature News: 575 megatons 575 megatons one third of all anthropogenic greenhouse gas emissions biggest causes one-third of total greenhouse gas emissions worldwide. one-third of total greenhouse gas emissions worldwide. roughly a third of emissions one-third of total greenhouse gas emissions worldwide. greenhouse gases 575 megatons one-third of human-caused greenhouse-gas emissions greenhouse gases CGIAR estimates biggest causes 575 megatons 575 megatons one-third of total greenhouse gas emissions worldwide. roughly a third of emissions one-third of total greenhouse gas emissions worldwide. CGIAR estimates Nature www.nature.com green house gases one-third a partnership of 15 research centers around the world. a partnership of 15 research centers around the world. Nature on agriculture and greenhouse gas emissions one-third of total greenhouse gas emissions worldwide. emit huge quantities of methane and carbon roughly a third of emissions roughly a third of emissions roughly a third of emissions 575 megatons 575 megatons Nature Consultative Group on International Agriculture Research 575 megatons 575 megatons 2012 analysis one-third of total greenhouse gas emissions worldwide. one-third of total greenhouse gas emissions worldwide. biggest causes one-third of total greenhouse gas emissions worldwide. one-third CGIAR estimates one-third of total greenhouse gas emissions worldwide. one-third of greenhouse gases 575 megatons about one third one-third of total greenhouse gas emissions worldwide. 575 megatons a partnership of 15 research centers around the world. CGIAR estimates a partnership of 15 research centers around the world. Nature News: biggest causes CGIAR estimates