The term "human emissions" refers to gases and particles released into the atmosphere as a result of human activities. These emissions are primarily composed of carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O), which are greenhouse gases that contribute to global warming, as well as other pollutants such as sulfur dioxide (SO2), nitrogen oxides (NOX), and particulate matter. Human emissions arise from various sources including the burning of fossil fuels for energy, transportation, industry, agriculture, deforestation, and waste management. These emissions have a significant impact on climate change, air quality, and public health, making them an important topic of study and policy attention.