1. deforestation
1.1. Chopping down trees
1.1.1. http://environment.nationalgeographic.com/environment/global-warming/deforestation-overview/
1.2. kills off animal species
1.2.1. http://www.worldwildlife.org/threats/deforestation
2. pollution
2.1. Burning of fossil fuels, such as cars and factories
2.1.1. http://m.livescience.com/22728-pollution-facts.html
2.2. burning oil
2.2.1. http://www.worldwildlife.org/threats/pollution
2.3. Walking, carpooling rather than using cars
2.4. http://www.lung.org/our-initiatives/healthy-air/outdoor/air-pollution/10-tips-to-protect-yourself.html?referrer=https://www.google.com
3. recycling
3.1. helps the earth by reusing materials
3.2. http://www.theverge.com/2016/4/15/11438840/apple-recovered-nearly-40-million-in-gold-through-its-recycling
3.2.1. https://www.epa.gov/recycle/recycling-basics
4. Topic: Energy Security
4.1. wars have been fought for sources of energy
4.1.1. http://www.iea.org/topics/energysecurity/
4.1.1.1. https://www.euractiv.com/section/energy/opinion/eu-must-avoid-prioritising-gas-in-energy-security-push/
5. global warming
5.1. creating a shortage of biodiversity
5.1.1. http://www.livescience.com/topics/global-warming/
5.1.2. https://www.nrdc.org/stories/global-warming-101
6. drought
6.1. costing california jobs
6.1.1. http://www.sfgate.com/news/article/Before-and-after-photos-of-California-reservoirs-7243336.php
6.1.2. http://www.mercurynews.com/drought/ci_29766133/california-drought-odds-la-nina-increase-next-winter