Climate Changes / Global Warming

Hello everyone!
The first topic of 8th and 9th forms is about climate changes, and all the aspects of life on Earth affected by them.
If your click on the title of this post, you will find a simple explanation of the greenhouse effect

The Story of Stuff

Here is a video that will make you think. Where do the things you buy come from? Where do they go to when they are old?
The world needs you to think about this problem!
This is the original documentary with portuguese subtitles (brazilian portuguese) so you must pay attention to the spelling.
The ideal thing would be for you to listen and look at the subtitles in case of emergency only.