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Greenhouse GasGases that trap heat in the atmosphere are called greenhouse gases.
Carbon dioxideCarbon dioxide is the primary greenhouse gas emitted through human activities. Carbon dioxide is naturally present in the atmosphere as part of the Earth's carbon cycle (the natural circulation of carbon among the atmosphere, oceans, soil, plants, and animals). Human activities are altering the carbon cycle–both by adding more CO2 to the atmosphere and by influencing the ability of natural sinks, like forests, to remove CO2 from the atmosphere. While CO2 emissions come from a variety of natural sources, human-related emissions are responsible for the increase that has occurred in the atmosphere since the industrial revolution.
What causes an increase in carbon dioxide?The main human activity that emits CO2 is the combustion of fossil fuels (coal, natural gas, and oil) for energy and transportation, although certain industrial processes and land-use changes also emit CO2.
Global WarmingDue to human activities releasing a lot of carbon dioxide into the atmosphere, carbon dioxide traps more heat. This excess heat is not able to escape from our Earth's atmosphere, causing the Earth's temperature to increase dramatically over the last century
Carbon footprintthe amount of carbon dioxide released into the atmosphere as a result of the activities of a particular person