What is global warming?give reasons

Due to global warming, the polar ice caps and mountain glaciers would melt and the amount of water in the ocean would increase. It leads to a rise in the sea level and the melting of glaciers and sea-ice due to warming.
Effects of Global Warming are:

1. Sea level will rise 48 cm by the end of the twenty-first century.
2. Increase the incidence of annual flooding.
3. Insect-borne diseases like malaria, and leads to shifting in climatic boundaries, making some regions wetter and other dries.
4. The agricultural pattern would shift and the human population, as well as the ecosystem, would experience change.
5. Peninsular India would be submerged.
6. Global warming refers to the increase in average ground temperatures on earth. These higher temperatures across the planet are caused by an intensification of the greenhouse effect.