Environmental risks can be mitigated, if the job location inherently has risks, you will be better off with a regulated industry where the regulations have teeth, and probably in a union. Stresses on the body are largely mitigated by having a job that takes more brain than back, but watch out for repetitive motion stuff and mitigate that yourself.

Mostly in the trades you get paid more for some mix of a) having in-demand skills and experience that aren't easy to acquire fast, b) putting up with unpleasant environments, or c) accepting risks. You can probably trade off c against a mix of a) and b).

So for example being a tool and die maker in general is way safer than being a faller. Watch for industry specific stuff too. Kicking carpet is more pleasant and less dangerous than electrical, but it won't pay well and your knees are likely screwed by your mid 40s.