Answer :

Final answer:

Humans began releasing large quantities of greenhouse gases around 200 years ago due to activities like deforestation and fossil fuel combustion, leading to significant environmental impacts.


Explanation:

Humans started releasing large quantities of greenhouse gases about 200 years ago, primarily due to activities such as deforestation and the combustion of fossil fuels for energy production and machinery operation. This increase in greenhouse gases, especially carbon dioxide, has significantly impacted the Earth's atmosphere and climate, causing rising global temperatures and various environmental issues.


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