traps far more heat than carbon dioxide and leaves the far faster.
Those two facts together make it the most useful gas to cut for anyone in a hurry.
Reducing methane lowers temperature within a decade rather than within a century.
Agriculture is the largest source, mainly from and from flooded rice fields.
Rice is the case where the technical answer is unusually clear.
Fields flooded continuously produce methane; fields once mid-season produce much less.
are unchanged or slightly higher, and water use falls.
The practice has been known for two decades and is used on a small fraction of the area.
The obstacle is not the farmer but the system.
Draining a single field requires control of water that most schemes do not give an individual.
Where canals are managed collectively, the change requires an agreement, not a decision.
Cattle are harder, and most proposed answers are marginal.
Feed additives reduce emissions per animal and require daily administration that grazing systems cannot provide.
The measure that works at scale is a smaller , which is a demand question rather than a technical one.
Policy has concentrated on the technical options for the obvious reason that they offend nobody.