WHAT IS THE GREENHOUSE EFFECT:
Greenhouse effect is when heat/energy is trapped in the atmosphere by greenhouse gases. These gases obsorb and trap heat that enters our atmosphere and bounces off the earth's surface. It is an essential part of life on this earth. The heat reradiation is shown down from the sun and when it hits the surface of the earth reflects back into space, but instead of continuing into space it gets trapped in the atmosphere were it collects and heats our environment. Water vapor is the most abundant greenhouse gas, which isn't a bad gas but can still trap heat/energy. Other gases include carbon dioxide, methane, and other gases.

Natural greenhouse effect is a essential effect that occurs on the earth, without it the temperature would fall below 0 degrees Fahrenheit (-18 degrees Celcius) instead of an average of 57 degrees (14 degrees Celcius); too cold for human to have developed in. So the greenhouse effect is not a problem. The problem stems from the question: Does human activity effect Global Warming by leading to increasing Greenhouse gases emission? This can be through burning of fossil fuels, increase industrial farms, and deforestation.