The correct answer is the greenhouse effect. The greenhouse effect refers to the trapping of heat energy in the Earth's atmosphere due to high levels of carbon dioxide and other greenhouse gases. This process occurs naturally and helps to keep the Earth warm enough for life. However, human activities, such as burning fossil fuels and deforestation, have significantly increased the concentration of greenhouse gases in the atmosphere, leading to enhanced greenhouse effect and subsequent global warming and climate change. So, the option "greenhouse effect" best describes the trapping of heat energy due to high levels of carbon dioxide in the atmosphere.
The trapping of heat energy due to high levels of carbon dioxide in the atmosphere is described as the greenhouse effect.
