Well I agree with some of what you said, Denmark hasn't done nearly enough, but they have done quite a bit, and they aren't any closer to an economic crash after that than they were before it. This leads me to doubt the claim that addressing climate change will cause a crash, let alone a crash as bad as what would be expected if the IPCC assessments come to pass.
It's quite a stretch to pick Denmark with excellent geographic conditions, great economy and surrounded by similar wealthy countries to point out that if they can do it, then surely everybody else can too without significant consequences.
I mean, we could stop CO2 emissions "tomorrow" if we really wanted to. We just need massive investments in tons of infrastructure, stop building with concrete, convince people not to travel, etc. Which - now as I type this - sounds like COVID lockdown to me which we still haven't recovered from fully. Even minor shifts in trends have cascading effects in the economy, so I'm not surprised at all, that things are going so slowly.
