¿Are we greener now?
I think we are greener now than before, because now we are more interested because we produce a lot of pollution
main components with simple machines
click here https://drive.google.com/open?id=0B6CyOEmon-ksanU0XzEwUmpkVVhhOVJDOUVRWkN4cTJZbXo4
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