Mann serves on the advisory board of The Climate Mobilization, an American grassroots advocacy group calling for a national economic mobilization against climate change on the scale of the home front during World War II, with the goal of 100% clean energy and net-zero greenhouse gas emissions by 2025. Mann has often called for WWII-scale climate mobilization as a means of rapidly reducing greenhouse gas emissions. In June 2015, Mann criticized the G7 nations' goal of full decarbonization by 2100 as not very meaningful considering greenhouse gas emissions need to be reduced dramatically within the next decade, well ahead of the G7's timeline. "In my view, the science makes clear that 2050 or 2100 is way too far down the road," he told Climate Central. We will need near-term limits if we are going to avoid dangerous warming of the planet."