What is the major cause of the greenhouse effect?

The greenhouse effect is often caused by the atmospheric accumulation of gases. Those gases tend to be Carbon Dioxide and/or Methane

Explanation:

The greenhouse effect is caused by these gases because Carbon Dioxide and Methane absorb some of the heat that radiates off of Earth's surface, trapping the heat and then the greenhouse gases absorb the heat and it leads to a rise in its temperature

Explanation:

main gases that responsible for greenhouse effect are co2,methane, water vapor and nitrous oxide

all occurs naturally

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really and truely i dont know sorry