Research shows that when human-made materials like these burn, the chemicals released are different from what is emitted when just vegetation burns.

The overwhelming majority of scientists agree that climate change is caused by burning fossil fuels and other activities that emit greenhouse gases.

The most vivid auroras occur when the Sun emits large clouds of particles called coronal mass ejections.

The dual-fuel ferry has more car capacity but requires larger engines which also emit methane, a greenhouse gas with a far greater global warming effect than CO2.

Ministers say fresh rules announced today will limit the development of new waste incinerators, which burn rubbish to make electricity and emit gases that are harmful for the environment.