If the environment is important to you, then you might consider that offshoring to China also offshores the pollution as well, where if it were still manufactured within the US we wouldn't have the problem.

It's a little disingenuous when someone claims that the US meets its climate change goals and that China doesn't. The US is able to meet those goals in part because all of the goods it consumes comes from China where it is manufactured with coal-produced power and so-on.

I suspect that economic theory doesn't adequately explain some things that we need to understand better. There may be misunderstood risks in competitive advantage that we are ignoring at our peril.