Human activities are causing global warming. Combustion of fuel produces many pollutants. Humans can reduce their impact on the environment.
Without greenhouse gases in its atmosphere, the Earth would be about 18°C colder on average than it is now. That would make it too cold to support life as we know it.
Greenhouse gases present in the atmosphere include:
These greenhouse gases:
The diagram gives more details about this process, called the greenhouse effect.
Name three greenhouse gases.
Carbon dioxide, methane and water vapour.