climate change
- Created by: Devika_C
- Created on: 03-11-19 14:39
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- CLIMATE CHANGE
- evidence
- then
- fossil records
- looks at oxygen trapped in layers of ocean sediments
- now
- shrinking glaciers & melting ice
- melting = more water = expanded oceans = higher risk of flooding
- rising sea levels
- melting = more water = expanded oceans = higher risk of flooding
- seasonal changes
- tree flowering and bird migration
- shrinking glaciers & melting ice
- all shows global warming is true
- then
- causes
- natural
- orbital changes
- milankovitch cycle
- eccentricity - 100,000 years = change from circular to oval
- this constantly changes the earth's distance from the sun
- axial tilt - 41,000 = change in tilt - 21.5-24.5
- this constantly changes the earth's distance from the sun
- precession - 26,000 years = axis wobbles
- eccentricity - 100,000 years = change from circular to oval
- milankovitch cycle
- solar activity
- sun spots - dark patches on the surface of the sun which show reduced surface temperature
- high energy solar flares which has an increasing output of heat
- sun spots - dark patches on the surface of the sun which show reduced surface temperature
- volcanic activity
- volcanic ash
- blocks the sun
- sulphur dioxide
- converted into droplets of acid and acts like mirrors which reflect the solar radiation back into space
- volcanic ash
- orbital changes
- human
- greenhouse gas effect
- naturally keeps the earth warm enough to support life
- greenhouse gases traps heat that would escape to space
- allows short-wave radiation(light) from the sun to the earth
- traps long wave radiation (heat) that would escape to the atmosphere
- human impact on greenhouse gases
- 60% of the warming greenhouse gases = CO2
- most carbon dioxide comes from burning fossil fuels
- deforestation of tropical rainforests are also a major source
- methane is growing faster due to rice farming, sewage treatment, farm livestock etc
- 60% of the warming greenhouse gases = CO2
- greenhouse gas effect
- natural
- managing the impacts of climate change
- alternative energy sources
- burning fossil fuels = 87% of all CO2 emissions
- use : hydro electricity, nuclear power, solar, wind and tides
- provides sustainable, low carbon alternatives
- carbon capture
- uses tech to capture CO2 produced from burning fossil fuels, then its used for long-term storage in geological reservoirs eg; gas wells
- planting trees
- trees act as carbon sinks, removing CO2 by photosyn.
- international agreements
- governments are negotiating towards a more sustainable future
- paris agreement : 2015: first legally binding global climate deal
- aim: limit temp increase to 1.5 degrees above pre-industrial levels
- paris agreement : 2015: first legally binding global climate deal
- governments are negotiating towards a more sustainable future
- alternative energy sources
- global impacts
- more heat-related diseases and illnesses
- reduced crop yields and water supplies
- low-lying coastal areas are more likely to flood
- more extreme weather
- adapting to climate change
- agricultural adaptation
- farmers will need to
- cope with extreme weather
- manage water supply
- plant trees to shade seedlings
- change crops to suit the new climate
- farmers will need to
- risks from rising sea levels
- threaten important agricultural land
- increase rates of coastal erosion
- contaminated freshwater supplies with salt water
- reducing risks
- construction of sea walls
- construction of artificial islands
- restoration of coastal forests
- building houses on stilts - 3m high
- agricultural adaptation
- evidence
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