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As carbon dioxide levels in the atmosphere increase global warming increases, assuming no other changes.Apart from water vapor, carbon dioxide is the most abundant greenhouse gas in the atmosphere. Greenhouse gases allow energy from the sun to pass through and reach the Earth.Human activities have increased the concentration of carbon dioxide in our atmosphere, amplifying Earth's natural greenhouse effect. Despite the global pandemic, the global average amount of carbon dioxide hit a new record high in 2020: 412.5 parts per million.The present concentration is the highest for 14 million years. The increase has been attributed to human activity, particularly deforestation and the burning of fossil fuels. This increase of [tex]CO_2[/tex] and other long-lived greenhouse gases in Earth's atmosphere has produced the current episode of global warming.