Contemporary climate change
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when was IPCC set up?
1988 by WMO and UNEP
evidence for contemporary climate change
• mean global surface temp risen by 1.1 degrees C over last century • 2010s were the warmest decade in 1000 yrs • melting glaciers • arctic temperatures
thermosteric rise
oceans warming up. only occur with energy imbalance sea level rise is a cause
arctic amplification
arctic warming more than anywhere else. huge reduction in sea ice extent and volume less albedo = + feedback
are projections right?
they’re good for temp, not ice or precipitation
when is there an marked increase in GHG
1750 due to human activities
how long is the suns solar cycle
11 years no correlation with climate change so climate probs not driven by sun
what should we do about changes?
act mitigation is crucial as we won’t be able to adapt quick enough