1. http://cdiac.ornl.gov/trends/emis/tre glob 2014.html
2. http://data.giss.nasa.gov/gistemp/graphs v3/
3. http://unfccc.int/resource/docs/2015/cop21/eng/l09r01.pdf
4. https://www.epa.gov/ghgemissions/global-greenhouse-gas-emissions-data
5. https://www.ipcc.ch/pdf/special-reports/srccs/srccs wholereport.pdf