Greenhouse gases and climate change

The idea

Water vapour, carbon dioxide and methane are greenhouse gases: they let short-wavelength radiation from the Sun through but absorb long-wavelength radiation emitted by the Earth, keeping the Earth warm. Human activities such as burning fossil fuels, deforestation, cattle farming and landfill increase greenhouse gases. Most scientists agree this is causing global climate change: rising sea levels, more extreme weather and changes to species. A carbon footprint is the total greenhouse gas emitted over the life of a product, service or event.

1. Name the greenhouse gas and its source.
2. Explain the greenhouse effect with wavelengths.
3. Give effects and ways to reduce emissions.

Watch out Greenhouse gases absorb the long-wavelength radiation the Earth gives out, not incoming sunlight.