Study Identifies Drivers of Reduction in US Greenhouse Gas Emissions Written by AZoCleantechMay 6 2021 In 2005, greenhouse gas (GHG) emissions from residential energy use hit an all-time high in the United States. Each year since, emissions have dropped at an average annual rate of 2 percent. In a study published in Environmental Research Letters, "Drivers of change in US residential energy consumption and greenhouse gas emissions, 1990-2015," a team of researchers from the Yale School of the Environment (YSE) outlined several factors that have contributed to this decrease, highlighting efficiencies in new home construction, energy consumption and household appliances, as well as less emissions in electric generation.