No, I'm not sure. But we're talking about private companies now, not governments. Governments and companies in the end are two faces of the same coin: the first aim at power, the latter aim at profit (with some exceptions of course).
Moreover, many proposed alternatives to capitalism consider the governments (as we know them today) harmful and unnecessary. I'm not saying I agree, just wanted to point out that removing capitalism does not automatically mean to give more power to governments.
> Anyhow, the way to deal with pollution in a market based economy is to tax it.
Sure, but that doesn't solve the problem, it just reduces its impact. And in a world that runs on profit, limiting your local companies may in the end give an advantage to the foreign ones, so this solution may not always be practicable, unless a truly global coordinated action gets taken.