If the market can’t take care of it, then it’s safe to say that the majority of Americans just don’t care, or don’t believe it to be that big of an issue.
It's pretty clear from your comments that you don't understand how markets actually work. I've been pointing out the flaws in the markets-as-a-panacea approach that you've been hinting at, and you've just been waving off my concerns without actually addressing - or even asking about - them.
Markets don't function well in all situations - rather, their efficiency requires certain criteria to be met. Otherwise, the market can become distorted, leading to all sorts of strange and undesirable outcomes.
Wikipedia has a good definition of market distortion along with a list of common causes:
Market distortion - Wikipedia
As I mentioned earlier, asymmetric information is a problem with pollution. Even if a buyer is concerned about pollution and willing to allow his purchasing decisions to be influenced by how "green" a product is, it can often be difficult, if not impossible, to obtain that information from the seller. "Green" products can't succeed in the market if buyers can't sufficiently discern which products are actually "green".
The issue of externalities falls under the protection of property rights listed on the market distortion page. Basically, if government doesn't sufficiently protect your property (e.g. groundwater, air for breathing, etc) from my pollution, then I'm effectively free to pollute your stuff without your approval.
Wikipedia's page about externalities is also pretty decent:
Externality - Wikipedia
"Green" products can't succeed in the market (or will at least have a difficult time doing so) if non-"green" products enjoy a price advantage stemming from their ability to shunt a portion of the manufacturing cost onto third parties. High-pollution products are, essentially, cheating by having their prices subsidized via government inaction.