Climate and change
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- Created by: Sophie Russell
- Created on: 30-05-13 22:17
Name the 3 theories regarding natural causes of climate change?
1) The sunspot theory 2)The eruption theory 3) Milankovitch cycles
1 of 17
Explain the sunspot theory
The output of energy from the sun varies. Sunspots on the sun show that it is emitting more energy. There is a correlation between solar output and global temperatures
2 of 17
Explain the eruption theory
When volcanoes erupt, the gas and ash can be spread through the strosphere around the globe. This alters the way light and heat reaches us on earth. Light can be reflected, cooling the earth. Sulphate aerosols
3 of 17
Name the 3 Milankovitch cycles
1) Shape of orbit 2)Tilt 3)Wobble
4 of 17
Explain how each of these affect climate changes
1) shape of orbit can be elliptical or round, altering the distance from the sun, and also precipitation and heat. 2) from 22.5-24.5 tilting away=colder 3) The earth wobbles on its axis and this alters the distance from the sun, affecting temperature
5 of 17
Name 2 pieces of evidence from the distant past showing a changed climate
1) fossilised animals/plants that no longer exist in the UK 2)U-shape valley, caused by retreating glaciers 3)
6 of 17
Name 4 pieces of evidence from the recent past showing a changed climate
1) diaries 2)newspaper articles 3)photos and drawings 4)recorded dates of harvest, bird migration etc
7 of 17
Why did Erik the Red and the vikings struggle to live in Greenland during the Little Ice Age?
Vikings moved there when there was no ice, they had over 200 farms and 4000 vikings. deforestation increased soil erosion, crops/animals could not survive in the LIA. Overgrazing. Too dependent on trade links Iceland. Sea Ice stopped them.
8 of 17
Explain the theories of why dinosaurs became extinct
A strike by a massive asteroid in Mexico/A huge volcanic eruption in India. Both of these possibilities lead to the cooling of the earth, thus plants struggled to survive, breaking down the food chain
9 of 17
Explain how megafauna became extinct
When the last major ice age ended, animals migrated to a climate in order to find suitable food. this disrupted food chains. Humans also hunted mega-fauna for tusks and goods
10 of 17
Name three results of climate change that could affect Malawi
Higher rainfall, shorter rainy season, higher temperatures (risen by 2.3% since 1970)
11 of 17
Explain two of these
1)Higher temperatures> traditional crops are not suited to this climate>failed crops(hunger) or need for new crops (money)> loss of income 2)shorter rainy season>travelling further for water>less time for education.
12 of 17
2 costs of a warmer UK
Farmers might have to change crops to ones that need less water. More illnesses such as skin cancer and heat stroke
13 of 17
2 benefits of a warmer UK
More people could take Holidays to the UK, bringing money to the tourism industry. New crops could bring new opportunities for farmers.
14 of 17
Name a national agreement regarding climate change and its aims
The Stern Review 2005- UK government agreement. recommended that we spend 2% of GDP reducing GHG pollution. t warned that the effects of global warming could reduce our GDP by 20%
15 of 17
Name an international agreement regarding climate change and its aims
Kyoto agreement 1997- 181 countries signed to reduce emission by 5.2%. the effects of global warming will be felt polluting and non-polluting countries, therefore an international agreement is needed
16 of 17
Explain the greenhouse effect and enhanced greenhouse effect
The greenhouse effect is a natural process, which allows life on earth. The enhanced greenhouse effect is caused by humans. The GHGs which are emitted trap moreradiation from the sun than is required. Radiation is reflected back by GHGs. Warming
17 of 17
Other cards in this set
Card 2
Front
Explain the sunspot theory
Back
The output of energy from the sun varies. Sunspots on the sun show that it is emitting more energy. There is a correlation between solar output and global temperatures
Card 3
Front
Explain the eruption theory
Back
Card 4
Front
Name the 3 Milankovitch cycles
Back
Card 5
Front
Explain how each of these affect climate changes
Back
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