1. https://www.un.org/en/sections/issues-depth/climate-change/.
2. https://www.nationalgeographic.com/environment/global-warming/global-warming-overview/.
3. https://www.esrl.noaa.gov/gmd/ccgg/trends/.
4. https://climate.nasa.gov/news/2945/nasa-noaa-analyses-reveal-2019-second-warmest-year-on-record/#:∼:text=NASA%2C%20NOAA%20Analyses%20Reveal%202019%20Second%20Warmest%20Year%20on%20Record,-Credit%3A%20NASA's%20Goddard&text=According%20to%20independent%20analyses%20by,record%2Dkeeping%20began%20in%201880.
5. https://www.iea.org/reports/global-energy-review-2020/renewables.