What is global warming?
Global warming is the continuous rise in the Earth's average temperature. It is caused by the release of greenhouse gases such as carbon dioxide, which trap heat in the atmosphere through the greenhouse effect. Burning fossil fuels such as coal and petroleum is the main source of these gases.
Key idea
Global warming is caused by greenhouse gases and can be reduced by cutting emissions and using green technology.
Effects of global warming
- Rising sea levels caused by melting polar ice.
- Extreme weather such as more frequent floods, droughts and storms.
- Crop failure and threats to the food supply.
Mitigation measures
We can reduce global warming by cutting greenhouse gas emissions, using renewable energy and green technology, and replanting trees (reforestation), which absorb carbon dioxide.
Remember
Carbon dioxide is the main greenhouse gas; planting trees helps to absorb it.