The average temperature on planet Earth is higher than you would expect just from the heating of sunlight alone. What is the explanation for this?
A) solid material hitting the Earth from space heats it up
B) carbon dioxide (and other gases) in the atmosphere cause a greenhouse effect
C) the rubbing of the continental plates warms up the Earth's surface
D) the heat given off by living things makes our planet warmer
E) we have no explanation for this higher temperature and that has scientists worried
Section 8.5: Cosmic Influences on the Evolution of Earth

Question

Quizplus · Accepted Answer

Carbon dioxide and other gases in the atmosphere trap heat close to the surface of the Earth. This is known as the greenhouse effect and it keeps our planet warm enough to sustain life. Without this effect, the average temperature on Earth would be much colder. However, an excess of greenhouse gases from human activities, such as burning fossil fuels, is causing the Earth's temperature to rise at an alarming rate and causing climate change.

The Average Temperature on Planet Earth Is Higher Than You