"Might" work is easy.

Want to reduce carbon emissions? Glass a major country. It "might" work. Ideas that "might" work are only useful in a thought experiment context. What is needed are ideas that very likely will work, but beyond that, far beyond that, is ideas that can be implemented. Nuking China into obsidian and shadows would 100% fix pretty much all environmentalists' concerns, straight-up. Every single complaint they make and concern they bring it WOULD be solved by it. It's beyond "very likely", it's nigh 100%. But it is a horrific, farcical solution that could never, and should never, be implemented...

...Unless of course the environmentalists are right and the world is doomed in but 6 years unless some ridiculous drastic steps are taken. Luckily they're just lying con artists.