The head of Salafi Arabia's state oil company warns that the expectation that the fossil fuel industry is likely to shrink endangers its certitude of rushing us off the climate cliff without any slowdown.

If oil prices go down, that encourages users to use oil rather than switch to renewables or reduce energy use.

If oil prices go up, that encourages planet-roaster companies to build more oil wells.

But if we put a heavy tax on use of oil, we get the best of both possibilities: a high selling price that encourages users to use less oil, and low income for oil companies that discourages planet-roasters from drilling for more.

To achieve this goal, it needs to be a heavy tax — a small tax would have a small effect. Weak measures of any kind won't achieve the goal.