Question

Human activities

Answer 1

C

Greenhouse effect is the warming of planet due to greenhouse gases in the atmosphere trapping infrared radiation reflecting from the earth's surface.

Explanation:

The earth has a natural greenhouse effect that comes from natural events like volcanos the spew gases such as carbon dioxide into the atmosphere.  Even wildlife and bacteria produce carbon dioxide and methane from respiration. These greenhouse gases maintain are relatively safe greenhouse effect that keeps the planet warm. Without the greenhouse effect, the earth’s average temperatures would be -18 degrees centigrade. The greenhouse gases are regulated by uptake b carbon sinks like forests.

However, humans have exacerbated this greenhouse effect by spewing more carbon dioxide in the atmosphere(more than it is taken up by processes like photosynthesis) hence increasing the greenhouse effect responsible for increasing global temperatures.

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