We can take out the other greenhouse gases, as well.
Today, the President said he would take action on greenhouse gases later this year.
But the new $23 billion plan is a key part of the union's strategy to cut greenhouse gases.
Below is a table for the sources of greenhouse gases, taken from data in 2008.
Increased levels of greenhouse gases must cause the Earth to warm in response.
Developing countries are also a growing source of greenhouse gases.
"What had been thought was a major greenhouse gas turns out in fact to be having a cooling effect," he said.
For climate change, it makes no difference where the greenhouse gas is produced.
Science: Find out more about methane's role as a greenhouse gas.
But greenhouse gases seem to have helped drive the cycle.