They're struggling to kill off the fossil fuel industry because the alternative to cheap, reliable coal/natural gas is expensive (when accounting for energy storage + backup energy production capacity), less reliable renewables.
Ironically, they'd have a much easier if the alternative to cheap, reliable coal/natural gas was cheap, reliable nuclear energy!
It's a lot harder to affect something that's so firmly embedded in how we do things as a society. Blocking new nuclear developments was a lot easier than undoing generations worth of infrastructure around fossil power.
A comparison can be drawn to the USA's short-lived attempt at prohibition of alcohol versus the long-lasting prohibition of marijuana which is only now finally calling apart.
The one our society has been at least partially built around for generations has its problems normalized and mostly disregarded until something unignorable happens, which still often gets swept under the rug, where the alternative gets constant scrutiny and has to meet standards the established norm has never been held to.