References
Barrett, S. & Dannenberg, A. (2013, July 13). Sensitivity of collective action to uncertainty about climate tipping points. Nature Climate Change, 4. (36-39) doi:10.1038/nclimate2059
Domonoske, C. (2017, June 1). So What Exactly Is In The Paris Climate Accord? Retrieved from https://www.npr.org/sections/thetwo-way/2017/06/01/531048986/so-what-exactly-is-in-the-paris-climate-accord
Earth Science Communications Team at NASA's Jet Propulsion Laboratory (2018, April 19). Vital Signs of the Planet. Retrieved from https://climate.nasa.gov/
Hansen, J. (2007, December 14). Global Warming "Tipping Points" Reached, Scientist Says. Retrieved from https://news.nationalgeographic.com/news/2007/12/071214-tipping-points.html
Katzenberger, D. (2014, June 30). Earth’s Climate: Stable up to a (Tipping) Point. Retrieved from http://sitn.hms.harvard.edu/flash/2014/earth-climate-tipping-point/
Krupp, F. (2015, Feb 10). The World Can Turn the Corner on Climate Change by 2020. Here's How. Retrieved from https://www.edf.org/blog/2015/02/10/world-can-turn-corner-climate-change-2020-heres-how
Morello, L. (2012, June 7). Is Earth Nearing an Environmental “Tipping Point”? retrieved from https://news.nationalgeographic.com/news/2007/12/071214-tipping-points.html