1. Razdan A. August 2016, Power for All. 2016;Aug. 7–14.
2. Energy in the 21st century;Chen;China Pet Proc Petrochem Technol Q,2000
3. CO2.earth n.d. 〈https://co2.earth/〉.
4. 350.org n.d. 〈http://400.350.org/〉.
5. Scripps Institution of Oceanography. The Keeling curve n.d. 〈https://scripps.ucsd.edu/programs/keelingcurve/〉.