GCSE Combined Science (AQA)

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Pollution

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Energy National and global energy resources

Pollution

2:22 Environmental Impact of Energy Resources
Spec 4.1.3
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  • Burning fossil fuels releases large amounts of carbon dioxide into the atmosphere.
  • Energy from carbon bonds in fossil fuels reacts with oxygen, releasing carbon dioxide.
  • Factory gas released from burning fuel cannot be disposed of or stored, unlike steam from cooling towers.
  • CO2 is the chemical formula for carbon dioxide, contributing to global warming.
  • Burning fossil fuels changes atmospheric structure, trapping heat and contributing to global warming.
  • Scientists advocate for stopping fossil fuel use, but political and economic reasons prevent this.
  • Carbon dioxide is also released when burning biofuels, similar to fossil fuels.
  • Biofuels are carbon neutral due to the carbon cycle; carbon absorbed by plants is released when burnt and reabsorbed by new plants.
  • Fossil fuels release carbon stored for millions of years all at once.
  • Burning coal releases sulfur dioxide due to sulfur content in coal.
  • Sulfur can be removed from coal, but it is an expensive process.
  • Sulfur dioxide reacts with water in clouds to form acid rain, which is harmful to plants and buildings.
  • Understanding pollution details is not necessary for exams, but reasons for or against using certain fuels may be required.

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