Question

which statement best describes changes in atmospheric carbon dioxide? carbon dioxide levels have increased. carbon dioxide levels have decreased. carbon dioxide levels are unable to be measured. carbon dioxide levels have remained the same.

Explanation:

Over time, due to human activities like burning fossil fuels (coal, oil, gas) and deforestation (which reduces the Earth's capacity to absorb \(CO_2\) through photosynthesis), the amount of carbon dioxide in the atmosphere has been on the rise. This is a well - documented fact in environmental science. For example, the Keeling curve shows a continuous increase in atmospheric \(CO_2\) levels since the 1950s.

Answer:

Carbon dioxide levels have increased.