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To save the ozone layer. The celebration is all the more special, because the treaty worked. Thanks to the treaty, more than billion tons of carbon dioxide-equivalent emissions were prevented from reaching the atmosphere between and It is estimated that up to 2 million cases of skin cancer worldwide may be prevented each year by Those rays can cause skin cancer, cataracts and impaired immune systems and threaten plant growth and food chains.

In , scientists discovered that the ozone layer was getting thinner.

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Then they found that the problem was probably caused by human activities. The atmospheric layer was being depleted by chemicals called chlorofluorocarbons CFCs , which were at the time widely used in aerosol cans, fire retardants and fridges, among other things.

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In particular, scientists saw that there were very large decreases in ozone concentrations over Antarctica. So much so, that it became known as the Antarctic Ozone Hole. In , countries came together — eventually in total — and agreed to stop using CFCs and similar ozone-depleting chemicals by signing the Montreal Protocol on Substances that Deplete the Ozone Layer.

The protocol was agreed on 16 September and entered into force on 1 January In , scientists discovered that the agreement was working. The ozone layer was healing. Using a combination of measurements from satellites, ground-based instruments and weather balloons, a team of scientists found that since the hole has shrunk by 4 million square kilometres — an area bigger than India.

| Thompson, Alasdair | Arty Bee's Books

This group of chemicals replaced CFCs because they are ozone-safe. Although only comprising a small proportion of emissions, HFCs can be thousands of times more potent than carbon dioxide in contributing to climate change. The Montreal Protocol could be the single largest real contribution the world has made so far towards keeping the global temperature rise "well below" 2 degrees Celsius.

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This is the target agreed at the Paris climate conference last year. At current estimates, the hole will close completely around the middle of this century. The views expressed in this article are those of the author alone and not the World Economic Forum. More Details Other Editions 2. Friend Reviews. To see what your friends thought of this book, please sign up.

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More filters. Sort order. Alhaslam rated it did not like it Mar 26, Chad Kelly marked it as to-read Jun 02, Ashleigh Tuck marked it as to-read Jan 10, There are no discussion topics on this book yet. About Alasdair Thompson. Alasdair Thompson.

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