chlorofluorocarbons
The U.S. government banned the use of CFCs, and today, more than 197 United Nations countries have agreed to basic protocols designed to preserve and protect the ozone layer. However, some CFC replacements may also cause ozone-layer damage.
Greenhouse gases are gases that accumulate in the atmosphere, where they contribute to global warming by trapping heat near the earth's surface.
Particulate matter, such as soil, dust, and volcanic ash, is a naturally occurring air pollutant.
Exposure to polychlorinated biphenyls (PCBs), which were used for many years as insulating materials in high-voltage electrical equipment, is associated with birth defects, cancer, and skin problems.
1) Over the last 200 years, the amount of carbon dioxide (CO₂) in the atmosphere has been rising
2) The global temperature has also risen during this time - this global warming
3) There's lots of evidence that the rise in carbon dioxide has increased the greenhouse effect, causing global warming
4) More carbon dioxide means less heat escapes the atmosphere, so the temperature of the Earth increases
5) Global warming there's a scientific agreement that humans are causing global warming
6) Global warming is a type of climate change and it also causes other types. For example, changes in the weather
7) Carbon dioxide levels are rising for three reasons:
• Increased carbon dioxide emissions - burning fossil fuels releases carbon dioxide
• Increased energy usage - we use more electrical gadgets, and travel more in cars and planes. To produce the extra energy we burn fossil fuels, which releases carbon dioxide.
• Deforestation - carbon dioxide is released when trees are chopped down and burnt to clear land
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