It strikes me that with an absurdly low debt-to-gdp ratio of 34% and negative interest rates maybe the Danish government should invest more money in their economy. Maybe leverage the market to build the enormous amount of green infrastructure they and the world needs, the returns don't need to be that high to pay off.
Denmark has high oil and gas reserves, which partly is why their debt-to-gdp is so low. Why would they benefit in green energy infrastructure?
The worlds largest Wind Turbine Manufacturer Vestas is danish.
Besides them, there's lots of green energy infrastructures companies that are expanding. Also of note, the Large Danish companies LEGO and Novo Nordisk have already gone 100% CO2 neutral on productions through various offsetting initiatives[1]. Oil money is not something to flush down the toilet, but the country is moving very heavily in the green direction. The oil will dry up, or we'll reach a point where it's political suicide to keep going after it. But the wind will keep blowing and the sun will keep shining.
[1] yes that's not enough, but a good milestone on the road forwards