• Pertains to the average increase in earth’s surface temperature. 
• Long term warming of the planet since the early 20th century, and most notably since the late 1970s, due to the increase in fossil fuel emissions. 
• An aspect of climate change.

Causes of Global Warming

1. Increase in greenhouse gases
   1. CO2
   2. Methane – livestock, agri waste, decomposition of wastes in landfills
   3. Nitrogen oxide – fertilisers
   4. Fossil fuel combustion
   5. Emissions from industrial processes such as cement and limestone production etc.
2. Deforestation
3. Destruction of marine ecosystems
4. Population increase
5. Increased amount of greenhouse gases
   1. Due to burning of fossil fuels for generation of electricity, transportation etc.
   2. Carbon dioxide, carbon monoxide, hydrocarbon compounds, sulfur oxides, nitrogen oxides, methane and the particulates.