Because the governments manipulate the markets in many ways, not least by subsidising coal and limiting any progress on renewables.
Also the UK and Netherlands have terrible air quality that is linked to more deaths per year than we can really comprehend. The real issue is realising that we cant rely on the free markets to dictate our future. Why? Because there are zero ethics or any moral compass in the free market. We have to intervene at some point because we have much better clean solutions. With populations increasing we must start building a smarter and cleaner world.
Free markets have the same moral compass and ethics as the collective group that participates in that free market.
The question is do you trust in the collective wisdom of the free market? or do you trust more in the wisdom of a small number of "government elites" that will make rules on centralized basis to "help" the plebes.
Neither approach is perfect or foolproof.
Personally I have very low trust in most governments to make the best, or even close to best, decisions on a regular basis.
I recently found an interesting read on how government operates in Switzerland. On Steemit of course. That seemed like a format for government operation that would be more trusted.
STEEM On!!