You are mixing up 2 hockey charts. The CO2 hockey chart is no matter of discussion at all. The average temperature chart maybe. The interesting question is the correlation between these. Maybe have a look at the Vostok ice core data and then start to think.
Venus II, hopefully not, though. In earths history, there were much higher CO2 levels without a runaway greenhouse effect. But the UK citizens would mostly need to evolve into marine mammals ;-)
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