Which of the following is NOT a factor that contributes to "Global warming"?

Afforestation

THE CORRECT ANSWER IS oPTION 2: Afforestation

Various factors that are responsible for increase in global warming are:

1. Burning of coal and petroleum products (sources of carbon dioxide, methane, nitrous oxide, ozone)
2. Increase in CO2 due to deforestation
3. Methane gas released from animal waste