FACT CHECK: Trump's Claims About 'Record Clean' U.S. Air

Carbon emissions from the U.S. have declined in recent years, but they are certainly not at their lowest level.

The latest numbers from the World Bank show U.S. carbon emissions at levels last seen in the mid-1990s. Emissions were much lower in the 1980s and earlier decades.

Energy-related emissions fell 0.9 percent in 2017 compared with a year earlier and were 14 percent below 2005 levels, according to the U.S. Energy Information Administration.

The drop in emissions is attributed to a number of factors including state and federal regulations and more use of natural gas, which is less carbon-intensive than coal for power production.