Build back in German = zurückbauen = demolishing and recultivation. After the great culling the cities get replaced by forests.
That would be fine if that was the plan. There'll be a lot more room to let the forests reclaim city space when the invasion is repelled.
The sad part is that we will not see much nature anymore cause of the travel restrictions - to avoid pandemics, and because our personal CO2 balance doesn't allow it.
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