1.1 Background. The greenhouse gases emitted as a result of the development industries have been increasing, proved by an average temperature increase of 0.32°F (0.18 °C) per decade since 1981. From 1990 to 2015, the net greenhouse gas emissions from human activities increased by 43%, with CO 2 accounting for about three-fourths of total emissions, which increased by 51 percent ("Inventory of U.S. Greenhouse Gas Emissions and Sinks," 2023).