What is global warming? Write three impacts of global warming.

The excess accumulation of greenhouse gases in the atmosphere disturbs the energy balance. This can increase the heat and cause rise in air temperature. This increase in air temperature due to excessive concentration of greenhouse gases is called global warming.

Three impacts of global warming are:

1. Rise in sea level — Increase in air temperature would speed up the melting of glaciers, ice caps and other icebergs in the northern and southern parts of the world which will lead to the rise in sea level and the flooding of coastal areas.
2. Change in agriculture — Increase in air temperature may affect the world food production as the change in the rainfall pattern would affect crop yields and types of crops cultivated.
3. Climate change — As the earth heats up, the world climatic pattern will change. Floods, storms, heat waves, fires and droughts could also become more common.