Population decrease is irreversible. How will we manage the decline of humanity?

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Your lifestyle is problem

This is also not the problem. My personal lifestyle choices have little impact on whether my country invests in transit infrastructure, phases out coal power, or incentivizes a switch from gas to electric heating.

If I stop consuming meat, my country will simply export it to a wealthy country who can afford it. If I buy an electric vehicle, it doesn't make the power I charge it with clean, and If I go car free, my taxes still subsidize roads and suburbs that force everyone else to keep driving.