Reference List

1. https://spaceplace.nasa.gov/all-about-earth/en/
2. http://nbwatersheds.ca/fawa/human-social-system
3. https://www.khanacademy.org/science/biology/ecology/intro-to-ecosystems/a/what-is-an-ecosystem
4. https://www.theguardian.com/environment/2013/jun/30/stephen-emmott-ten-billion
5. https://eschooltoday.com/ecosystems/what-is-an-ecosystem.html
6. http://education.seattlepi.com/effect-human-activities-environment-3653.html
7. http://www.conserve-energy-future.com/causes-effects-solutions-of-overpopulation.php
8. https://www.britannica.com/science/pollution-environment
9. https://www.nrdc.org/stories/global-warming-101
10. http://www.ucsusa.org/global_warming/solutions#.WX9rZxWGO1s
11. https://humanlysustainable.com/2015/10/05/manbystevecutts/
12. http://www.conserve-energy-future.com/ozone-layer-and-causes-of-ozone-depletion.php
13. http://tw.tzuchi.org/en/index.php?option=com_content&view=article&id=1022%3Acaring-for-our-planet-our-home&catid=114%3Areflections-on-our-times&Itemid=325&lang=en