Lower prices to the consumer is the most obvious answer to your last question.
Either you take as a given that people will buy that GIJoe from China or they won't. If they will, some company is going to provide it; in your case it just happens to be Walmart. If the consumer won't buy it, no retailer will provide it.
If your argument is that we should attempt to assign economic penalties (taxes, if you will) on the externalities such that the true cost of those is reflected in the fuel that Walmart (and everyone else) buys, I'm all for it. If you're suggesting that the most appropriate way to correct for those externalities is to raise the income taxes on the Walmart execs who appear on the "top 20 retailer execs" list, I don't see even a tenuous connection with which I can agree.
Either you take as a given that people will buy that GIJoe from China or they won't. If they will, some company is going to provide it; in your case it just happens to be Walmart. If the consumer won't buy it, no retailer will provide it.
If your argument is that we should attempt to assign economic penalties (taxes, if you will) on the externalities such that the true cost of those is reflected in the fuel that Walmart (and everyone else) buys, I'm all for it. If you're suggesting that the most appropriate way to correct for those externalities is to raise the income taxes on the Walmart execs who appear on the "top 20 retailer execs" list, I don't see even a tenuous connection with which I can agree.