Quick Scoop

Global warming is the gradual increase in Earth’s average temperature because heat-trapping gases like carbon dioxide build up in the atmosphere. For Class 8, it is usually explained as a simple result of the greenhouse effect getting stronger due to human activities like burning fossil fuels and cutting down trees.

Simple Definition

Global warming means the Earth is getting hotter over time.

This happens when greenhouse gases trap more heat from the Sun instead of letting it escape into space.

Main Causes

  • Burning coal, oil, and gas in vehicles, factories, and power plants releases carbon dioxide.
  • Cutting down forests reduces the number of trees that absorb carbon dioxide.
  • Industrial activities and pollution increase greenhouse gases in the air.

Effects

  • Higher temperatures and hotter summers.
  • Melting glaciers and polar ice caps.
  • Rising sea levels and flooding in coastal areas.
  • Stronger storms, droughts, and other weather changes.

Prevention

  • Use public transport, cycle, or walk more often.
  • Save electricity and use energy-efficient devices.
  • Plant more trees.
  • Reduce pollution and use cleaner energy sources.

Class 8 Answer

If you need a one-line exam answer, you can write:

Global warming is the rise in Earth’s average temperature caused by the increase of greenhouse gases in the atmosphere.

TL;DR

Global warming is the heating of Earth caused mainly by greenhouse gases from human activities.