Which of the following is a factor that contributes to "Global warming"?

Burning of coal and petroleum products Aforestation Both 1 and 2 Neither 1 nor 2

Burning of coal and petroleum products

Various factors that are responsible for increase in global warming are: Burning of coal and petroleum products (sources of carbon dioxide, methane, nitrous oxide, ozone) Increase in CO2 due to deforestation Methane gas released from animal waste