Project 7

Project 7

Published on 12 September 2020
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Transcript
00:00
IMPACT OF HUMAN ACTIVITIES
00:02
1.Humans have released chlorofluorocarbons (CFCs), halons and methyl bromides into Earth’s atmosphere, causing ozone holes by breaking up the ozone molecules.
00:18
2.CFCs have been used in many applications, including refrigeration, air conditioning, aerosol sprays, propellant and cleaners for metals and electronic components.
00:30
3.The use of CFCs has been greatly reduced, thanks to international agreements on production and consumption of halogens containing gases.
00:41
EFFECTS OF OZONE HOLES
00:45
1.Human Activities - Damages DNA which suppresses immune system resulting in increase infectious diseases like skin cancer and eye cataracts.
00:55
2.Plants and trees - Reduces crop production, damage to seeds, reduces quality of crops.
00:60
3.Animals - Causes bacterial infections in animals, also causes bronchiolitis in them
01:05
4.Aquatic Organisms - Damage to plankton, aquatic plants, fish larvae shrimps, crabs and affects marine food chain.
01:17
5.Materials - Degrades paints, rubber, wood and plastics, especially in tropical region.
01:26
6.Ground level Smog - Increase in the formation of ground-level ozone as a pollutant.
01:35
CLIMATIC CHANGES DUE TO OZONE HOLES
01:37
1.Most man-made ODS are also very potent greenhouse gases. 2.Some of them are upto 14000 times stronger than carbon dioxide – the main greenhouse gas!