Physical and Human Causes of Climate Change
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- Created on: 16-04-19 16:44
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- Causes of Climate Change
- Natural Causes
- Milankovitch Cycles
- Stretch - Path of Earth changes from circle to ellipse every 96000 years.
- Tilt - Earth changes angle. Changes over about 41000 years.
- Wobble - Axis wobbles around in a circle - cycle of 22000 years.
- Affects distance from sun, changing amount of solar radiation.
- Tilt and wobble change amount of sun received at different times of the year.
- Sunspots on the Sun's Surface.
- Increase the sun's energy output.
- Cycles of 11 years.
- Climate may get cooler if there aren't any.
- This is thought to have a minimal impact.
- Volcanic Activity
- Material into atmosphere.
- Particles reflect rays back to space.
- Short term changes, eg. Mt. Pinatubo eruption caused global cooling.
- Milankovitch Cycles
- Greenhouse Effect
- We need the natural effect to survive on Earth.
- Natural atmospheric gases act like an insulator.
- Gases trap the heat- short wavelengths get reflected back to Earth.
- Carbon Dioxide and methane.
- Human Influenced
- Farming livestock produces methane.
- Rice Paddies - Flooded fields emit methane.
- Burning fossil fuels for energy.
- Deforestation- removal of trees that photosynthesise.
- Cement- made from limestone. Contains carbon which is released as CO2 when produced.
- We need the natural effect to survive on Earth.
- Natural Causes
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