What is the natural greenhouse effect, and how does it differ from enhanced global warming?

The natural greenhouse effect is the process by which greenhouse gases in the Earth's atmosphere trap some of the Sun's energy, keeping the planet warm enough to support life. Enhanced global warming refers to the additional warming caused by increased concentrations of greenhouse gases due to human activities, leading to more heat being trapped and resulting in climate change.

This question tests the student's understanding of the greenhouse effect and the distinction between natural processes and human-induced changes. It requires recall of definitions and the ability to explain differences.