An increase in carbon dioxide in the atmosphere will most affect the Earth's climate and weather patterns. This is because carbon dioxide is a greenhouse gas that traps heat in the atmosphere, leading to a phenomenon called global warming. As the levels of carbon dioxide increase, it enhances the greenhouse effect, causing the Earth's temperature to rise. This, in turn, leads to various climate-related phenomena such as changes in precipitation patterns, the melting of glaciers and ice caps, rising sea levels, more frequent and intense extreme weather events such as hurricanes and heatwaves, and disruptions to ecosystems and biodiversity.
