Carter writes that the choice will define Obama's legacy.
A petroleum lobby says the EPA has indicated it may flip-flop on its proposed levels for biofuels that must be blended into the nation's fuel supply.
Inconsistencies among agencies make it difficult to track information about environmental reviews across the government, the Government Accountability Office said.
EPA’s annual report on greenhouse gases found a 10 percent drop since 2005.
The EPA sent its draft rule on carbon emissions limits for existing power plants to OMB earlier this month.
Senate Republicans are pressing for a long-term energy plan in Europe to break Russia's energy stranglehold over the region.
Industry groups challenged the rule curbing mercury and toxic pollution from power plants.
The Environmental Protection Agency (EPA) released a series of technical white papers Tuesday about sources of methane emissions, asking the public to comment on the research to inform EPA’s efforts to reduce emissions of methane, which is the main component of natural gas.
Legislators said he should designate more public lands as national monuments.
Researchers said their study points to problems with the Environmental Protection Agency’s methods for measuring methane.