EPA Acting Administrator Andrew Wheeler, believes that this reduction came from technological breakthroughs in the private sector.

In particular, according to US EPA's findings, the total GHG emissions reduced by 2.7% since 2016, while emissions from large power plants were less by 4.5% since 2016, and 19.7% since 2011.

According to EPA, under the proposed Affordable Clean Energy Rule, carbon dioxide emissions from the US power sector would continue to decline, and expects a decrease of 34%, i.e below 2005 levels.

EPA collects emissions data from major industrial sources, such as power plants and oil and gas production and refining. EPA also collects data from upstream fossil fuel and industrial gas suppliers.