California’s program to turn cattle manure into natural gas is a climate shell game that doesn’t add up. The state pays cattle farmers to capture methane from manure and convert it into natural gas, which can be used to fuel vehicles or generate electricity. However, research suggests that this program overstates emissions reductions and may even lock in more warming in the future. The program’s complexities and loopholes allow major greenhouse-gas producers to ease restrictions and purchase credits instead of reducing their own emissions. Why it matters: this story highlights the shortcomings of California’s climate policies and the need for more direct and effective approaches to reducing pollution.