If the dirty countries plugged all the methane (natural gas - what a con-trick of a name) in the next 12 months things would also be better 10-15 years later when the methane atmospheric lifetime dies.
Renewables are cheap. just because the system for calculating your electricity bill is shit and out of date and you have utilities not passing on the savings are the reasons for high bills - why do you think they are installing renewables in places like Texas ?
Why do they want a loan from the Government when they've also just announced investing $15B in Finland? Maybe because they can default on payments if it goes tits-up and let the taxpayer bear the cost.
All the USA has to do is apply a tariff that brings up the price to USA levels so it can compete equally with home built products. Or make it slightly higher to give home grown stuff a breathing space. - That is sensible use of tariffs
"The measures taken did - nothing." - its not an overnight solution. its going to take hundreds of years for the excess CO2 to dissipate from our atmosphere. If they blocked all the methane leaks from fossil plants then maybe we might see some change in a decade or 2