Global warming is the long-term heating of Earth's surface observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth's atmosphere. This term is not interchangeable with the term "climate change."

Ways to reduce global warming are-

Save energy at home. Much of our electricity and heat are powered by coal, oil and gas.

Change your home's source of energy. 

Walk, bike or take public transport. 

Switch to an electric vehicle

Reduce, reuse, and recycle.