geog- world at risk- causes of climate change (physical)1

• Climate change is a long-term shift in the planet's weather patterns or average temperatures.

Little ice age; A cool period in Europe

Medieval warm period; warmth in the North atlantic climate. The 'Holocene' is our current warm period.

Long term climate change(Geological timescale);

ICE CRORES:-

• icse cores are removed from ice sheets from greenland and the arctic
• the ice cores reveal layers going douwn (similar to tree rings)
• the layers reveals seasons of snowfall, compressed and relayerd over the years
• Air bubbles trapped in the layers contain Co2
• The ice sheets show oxygen isotopes

OCEAN:-

• Helped to regulate climate change
• Act as carbon sinks
• Evapouration from oceans help to form clouds , vital for precipitation level regulation
• Ocean currents help to spread out evenly, warm water from the equator, to bole poles.
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