Is the American approach to combating climate change going off the rails?

Last year, President Obama set a goal of reducing carbon emissions by as much as 28 percent from 2005 levels by 2025, only 10 years from now.

Now, environmental experts are suggesting that some parts of the strategy are, at best, a waste of money and time. At worst, they are setting the United States in the wrong direction entirely.

That is the view of some of the world’s top environmental organizations, including Greenpeace, Friends of the Earth and the Sierra Club. On Tuesday, they argued in a letter to the White House that allowing the burning of biomass to help reduce consumption of fossil fuels in the nation’s power plants, as proposed by the Environmental Protection Agency, would violate the Clean Air Act.

It’s also the view of economists from the University of Chicago and the University of California, Berkeley, who on Tuesday released the disappointing results of a field test of the federal Weatherization Assistance Program, the government’s largest effort to improve residential energy efficiency.