They are not guessing when it comes to past flooding because they have the historic record to go by.
In areas where there is no written record, they can go by tree rings, sedimentary layers, etc.
They did not predict the flooding from increased CO2 levels alone, but also from higher temperatures, rising ocean levels from melt off, etc.
They are saying the floods will now start happening more often, possibly every year.
Here is a graph of ocean water levels over time.
This should explain how the warming has increased open water and caused more rain and flooding.
Forcing you to reduce CO2 harms no one.
If we restrict bad mileage cars, then we all save fuel costs and benefit instead of causing harm.
Of course those with farms or businesses will still be able to buy trucks however.
They just will have to show need.
Europe and Asia have always had 100 mpg, small displacement, turbo diesels.
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