In what ways do human activities create climatic hazards?
- Created by: Jake199
- Created on: 21-05-14 17:10
View mindmap
- In what ways do human activities create climatic hazards?
- Evidence for Human Induced Global Warming
- 315 ppm CO2 in air in 1950s, now 380 ppm
- Keeling Curve shows increase in overall CO2 in recent years
- 10 of the hottest years in the last have all been in the last 15
- Average temp increase of 1 degree since 1900
- Models predict average 3 degree rise in next 50 years
- 98% of glaciers are in retreat
- Anthropogenic Greenhouse effect creates Global Warming, which creates Climate Change
- Air Pollution
- Physical causes
- Sunlight
- High Temperatures
- No wind
- High pressure
- Human causes
- Traffic
- Industry
- Urbanisation
- Pollutants e.g SOx, COx, NOx
- Pm10 and Pm2.5
- Physical causes
- Los Angeles smog- worst through 1970s
- 11 million vehicles
- Located in sub-tropical high pressure belt
- Only 35 wet unsettled weather days per year
- Surrounded by hills, creating a temperature inversion for half the year
- Lack of public transport
- 1600 premature deaths due to respiratory disorders per year
- Children have a 10-15% reduction in lung capacity
- Dangerous levels of Smog for 100 days per year in 1970s
- Smog
- 'Soup of harmful chemicals
- NOx, COx and SOx react with sunlight to produce photochemical smog and ozone
- Evidence against human induced warming
- Ice cores show that the Earth's temperature fluctuates naturally- Malinkovitch cycles cause ice-age about once every 10000 years
- Some past temperature records are flawed
- Sunspot activity increases temperature on Earth
- Impacts of warming
- 2 degrees- Migrations further North, flooding of low lying areas, severe impacts on marine environments due to ocean acidificaiton
- 3 degrees- Ice free Arctic, drying out Amazon, more extreme weather
- 4 degrees- Flooded coastal Deltas, disappearing glaciers, 1bn depend on meltwater from Himalayas
- 6 degrees- Oceans become wastelands, desert expands greatly
- Evidence for Human Induced Global Warming
Similar Geography resources:
Teacher recommended
Teacher recommended
Comments
No comments have yet been made