[mtlmtlmtlmtl]

We already have a massive sovereign wealth fund built from investments seeded by oil income.

Last year, large phosphate deposits were found in Norway, effectively doubling the known world supply. Given a similar taxation model, we could keep growing the wealth fund even as we phase out the oil industry over time.

Though oil industry phase-out is not something with a political consensus behind it right now anyway. Labour and the conservatives tend to reach across the aisle on that topic.