Answer:
The greenhouse effect affects Earth's atmosphere. More specifically, it refers to the process by which greenhouse gases (such as carbon dioxide, methane, and water vapor) trap heat within the atmosphere, leading to an increase in global temperatures. This phenomenon is natural and necessary for life on Earth, but human activities (such as burning fossil fuels and deforestation) have led to an increase in the concentration of these gases, intensifying the greenhouse effect and contributing to global climate change.