If the proportion of carbon dioxide in Earth's atmosphere decreased significantly while the amount of atmosphere and its reflective properties remained unchanged, one of the most likely effects would be a decrease in the greenhouse effect. Carbon dioxide is a key greenhouse gas that helps to trap heat in the atmosphere. A reduction in its concentration would lead to less heat retention, resulting in a cooling of the Earth's surface temperature.
This decrease in temperature could lead to various climatic changes, such as shifts in weather patterns, impacts on ecosystems and agriculture, and potential disruptions to the broader climate system. Additionally, the reduction in greenhouse gases might slow the process of climate change that is currently affecting global temperatures, leading to a more stable climate in the long term. However, the specific impacts would depend on many factors, including the extent of the decrease in CO2 levels and other interactions within the climate system.
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