I'm not a big fan of unions in general (especially with regards to years = seniority in pay & firing), but on ergonomics I'm with them. It doesn't cost much to implement the warehouse in an ergonomic way, but clearly this company and many like it aren't doing that at all. That has a really important effect on the difficulty of the job.
well... it costs them something more than it cost to have it the way it is now, and since they don't have to pay for the effect on the workers working in the non-ergonomic warehouse, what's the point? If they had to pay for the health/welfare of their workers directly, they'd have an incentive to ergonimicize the place.