carbon+cycle+ICS17New

http://www.physicalgeography.net/fundamentals/9r.html

http://maxpixel.freegreatpicture.com/Funny-Farm-Animal-Agriculture-Sheep-Cute-161630

http://motherboard.vice.com/read/goodbye-world-weve-passed-the-carbon-tipping-point-for-good

https://en.wikipedia.org/wiki/Carbon

project: https://scratch.mit.edu/projects/141601552/#player