One barrier is that there are collective action problems all over the friggin' place. If it's profitable to pollute, and Company A does while Company B does no

One barrier is that there are collective action problems all over the friggin' place. If it's profitable to pollute, and Company A does while Company B does not, Company A will prevail. Okay, well, this is what we have governments for. Polluting is outlawed, and both companies are prevented from defecting. But there's more than one country in the world. And clean industry is expensive. So if country A pollutes, and country B doesn't... My point is that it's not enough to just "decide" to tone it down, because societies that don't (although they carry the seeds of their own destruction) will dominate ones that do.