Because border security something one can physically see and encounter. Climate Change is a big nebulous thing that could be causing everything or nothing (it’s just the weather!). Humans are HORRIBLE at thinking about the future.
Plus being a bunch of xenophobic bigots doesn’t hurt.
IIRC China is actually investing in greener energy power. They sort of have to with the levels of smog they experience in some parts.
But the whole “wut about China?” I hear people complains about reminds me of kids blaming “other kids were doing it” when they get in trouble.
If politicians were good at marketing, they would make it a competition or race. “We are going to dominate China in the race to greener energy!”
“But the cost?”
“We can afford it, we aren’t some 2nd tier country who can’t afford it.”