The last time CO2 reached the symbolic milestone of 400 parts per million in the atmosphere - in the Pliocene era - temperatures rose by between 3 and 4 degrees and sea levels were between five and 40 metres higher than today.Climate change is a slow-motion calamity, but also an economic opportunity for those who seek profit. Might be a good time to start businesses building seawalls, boats, or snorkels.
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