Climate Change

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Climate Change
Weather: Is what we get. Can change constantly (Air pressure, wind etc.)
Climate: Average weather conditions, what we get over a longer period of time
Climate Change: How the average weather conditions change over time.
17 of the 18 hottest years on record occurred 1995 ­ 2012. The temperature has already risen by 0.74
degrees in the last 100 years; considering a 2-degree temperature change shall create an irreversible change
of the world forever. In addition, further temperature increases could result in the Arctic being free of ice by
2060 and the loss of the majority of the world's Glaciers. There has also been additional sea level rise due
to thermal expansion and pH of Oceans has decreased (become more acidic) due to an increase in CO2
emissions.
How we can measure climate change
Some evidence goes back 800,000 years
Glacial: 100,000 Interglacial: 10,000
Long Term:
Ice Cores:
Taken from Greenland and Antarctic ice sheets
Measure CO2 given off when melted
Air bubbles in the core show CO2 in the ice
Glacial periods have low CO2 ppm
Interglacial periods have high CO2 ppm
Carbon levels are higher now than ever
Pollen Analysis:
Pollen from plants preserved in sediments
Scientists core peat bogs where the pollen is preserved in water-logged sediments
Match up the pollen grains to determine time and condition

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Sea level rise:
Sea levels are affected by water stored as ice
Raised beaches are formed when sea levels were higher. These can be dated
Medium Term:
Covers the last 20,000 years
Last glacial period ended 18,000 years ago
13,000 years ago, the climate cooled for 1,000 years.
Historical records:
Caveman drawings
Pictures
Journals etc.…read more

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