Global Warming and Greenhouse effect

Global Warming:

Is the increase of Earth´s average surface temperature due to effect of greenhouse gases, such as carbon dioxide emissions from burning fossil fuel or from deforestation, which trap heat that would otherwise escape form earth. 
http://video.nationalgeographic.com/video/101-videos/global-warming-101

Greenhouse Effect:

Is a process by which radiation from a planetary surface is absorbed by atmospheric greenhouse gases, and is re-radiated in all directions. Since part of this re-radiation is back towards the surface and the lower atmosphere, ti results in an elevation of the average surface temperature above what it would be in the absence of the gases.

https://www.youtube.com/watch?v=ZzCA60WnoMk