If that works at all, it only works in disincentivizing manufacturing in China.
That doesn't bring manufacturing "back home", it only brings it to other countries similar or even lower in standards as China, are you gonna tariff those too?
Err, yes, obviously. There aren't an infinite number of countries in the world. You could quite comfortably track all the countries that do and do not comply with Western environmental laws in Excel. Or declare a free trade area the conditions of entry to which are compliance. This is a very very easy problem to solve... once we wean ourselves off the cheap tat China produces.
It's not really that obvious because an escalating global trade-war is rarely good for anybody, and tariffs only end up costing the consumers.
That's also why even after years of Trump tariffs on China, and all kinds of other countries, there was still no major shift of manufacturing back to the US.
> This is a very very easy problem to solve... once we wean ourselves off the cheap tat China produces
That "cheap tat" is by now a globally unique industry [0] that took decades to be built, by a government that can centrally plan in the decades. You can't just replace something like that from one day to another, and it most certainly wouldn't be easy.
Easy. Tariffs on Chinese imports so its cheaper to manufacture cleanly back home.