> If Asia and US are not willing to decrease their CO2 emissions, Europe should also decrease it's efforts in CO2 emission reductions...

Already happening [0].

India (Tata, AccelorMittal, JSW Group) also lobbied for this with Netherlands (Tata), Luxembourg (AccelorMittal), France (AccelorMittal), Italy (JSW Steel Piombino), and Czechia (TŽ) as their steel manufacturers don't have access to green steel IP and German and Swedish manufacturers are uninterested in losing their competitive advantage - especially after the JSW Group (India) and ThyssenKrupp Steel deal collapsed because Germany wouldn't allow layoffs [3].

> I'm in favor of world wide CO2 emission tax

But Asia, the Middle East, LatAm, and Africa isn't because they want to industrialize as much as they can over the next 10-15 years.

> Coupling PV to electrolyzers and efficient hydrogen production using solar energy is still open research problem

India has already started doing this (hence the Solar PV overproduction [1] and preferential financing for electrolyzers [2]) but most electrolyzer manufacturing projects won't be completed until 2030.

And other countries will then inevitably put tariffs on India for this expansion, just like how India has tariffed Chinese expansion and China has tariffed Indian expansion.

Like I mentioned, every country knows that there is a 10-15 year window left to expand where possible, and every national and subnational climate plan or infra project now assumes 2C-2.4C by 2050 as a given.

> I found only that in 2026 grey ammonia costs about 250–400 USD/tonne (key cost drivers: Natural gas price), green ammonia (India solar) 600–900 USD/tonne (key cost drivers: electrolyser CAPEX, renewable electricity).

Here's a good overview of India's current grey and green ammonia market by India's primary GreenTech and CleanTech advisory firm [4].

[0] - https://www.ft.com/content/c3c33e7b-8faf-4f06-b281-112117aee...

[1] - https://www.bloomberg.com/news/articles/2026-02-17/india-s-s...

[2] - https://www.spglobal.com/energy/en/news-research/latest-news...

[3] - https://www.reuters.com/business/thyssenkrupp-jindal-agree-p...

[4] - https://jmkresearch.com/green-ammonia-is-only-10-costlier-th...