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Definition
includes topics such as global climate change, loss of biodiversity, destruction of the stratospheric ozone layer, etc
A. eath systems changing beacuse of humans
1. Humans are causing build up of green house gasses
2. Greenhouse gases absorb Inferred radiation (IR) Ir is part of longwave spectrum
3. Absortion warms greenhouse gasses and they let off heat
4. This is greenhouse effect and it is necessary to life it is NOT global warming |
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Definition
past changes in the Earth systems such as paleoclimate change
Paleo- "indicates past or old" we need to study this so we can figure out what is a natural change or what is a human change human change= anthropogenic ones |
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Definition
4 interconnected systems
A. atmosphere (gas)
B. hydrospher (water
C. biosphere (flora and fauna aka life
d. lithospher (solid)
E. cryosphere (ice)
the text groups ice as hyrosphere beacuse ice is water |
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| what does ice do when it melts? |
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Definition
| it does not! raise sea levels, but continetal melting does raise sea levels. not all scientists believe that this is true |
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| Measures atmospheric concentrations of c02 on top of mauna Loa this curve shows that CO2 has increased over time at mauna loa |
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pre industrial usa CO2?
c02 now? |
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Definition
(1800-1850) about 275-280 ppm
2008 284.8
Bottom line HUMANS have caused a raise in co2 |
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| somthing like a tree which absorbs CO2 |
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| volcanic emissions rotting vegetation and carbonate metamorphism |
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(CH4) green house gas very potent between 10-20 times more potent the co2. Colorless odorless gas
main component of natural gas
bacterial decomposition of plant and animal matter.
Methane is being released when frozen bodys of water thaw and methane gas bubbles are popped |
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| Destruction of ozone (O3) |
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Definition
Humans are partly responsible for destroying ozone because of CFCs which is product found in ones home
without pzone layer humans would absorb more shortwave radiation and could get cancer |
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humans cutting down trees less trees and plants more co2 because they cant absorb it if they are dead
Hunger will have to be delt with first because if people need room to grow food they will cut down trees |
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Definition
earth is 4.6-5.2 billion years old
1. warmer climate is more normal than a cooler climate
2.only five times in earths history it had a glacial face. |
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Definition
from most recent to oldest
A. plesitocene
b. permo-carboniferous
c. ordovician
e . precambrian- two glacial periods in this stage |
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Definition
indirect measurement of climate
ex. fossils tree rings ice cores stuff like that |
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Term
climate change
Long and short term |
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Definition
Long term causes: a. plate tectonics b. changes in luminosity for ex. dull sun or bright sun for example when the sun was young it was 30% less luminous earth was not ice ball because of low albedo
C. carbonate silicate cycle
D. thermohaline criculation
Short Term clmate change
a. Valcanos
b. Plankton
c. Changes in synoptic scale (atmosphericphenomena) |
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Term
climate change
Long and short term |
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Definition
Long term causes: a. plate tectonics b. changes in luminosity for ex. dull sun or bright sun for example when the sun was young it was 30% less luminous earth was not ice ball because of low albedo
C. carbonate silicate cycle
D. thermohaline criculation
Short Term clmate change
a. Valcanos
b. Plankton
c. Changes in synoptic scale (atmosphericphenomena) |
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| james lovelock and lynn margulis feel that life has been responsible for maintaining the earth's climates. also that the earth can heal it self and is self regulating |
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| earths largest mass extinction |
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Definition
| (286-251 mya) 90-95 percent off all species died, the dinosaurs evolved. cause of this extinction? most likely climate change |
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| Climate will absolutley change people should be worried |
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