Wetlands have seen a mysterious spike in methane emissions over the past two decades blickwinkel/W. Pattyn/Alamy
After years of taking a back seat to carbon dioxide, methane has seen a surge of attention as a potent greenhouse gas that must be reduced to meet climate targets. It is responsible for nearly a third of global warming so far. But just as many countries are starting to take steps to reduce methane emissions from fossil fuels and agriculture, climate change is causing methane emissions from wetlands and other hard-to-control natural sources to rise.
