I have no axe to grind, I'm only trying to examine what is true.
This is related to economics and business because governments are contemplating spending a lot of money on climate, and to require businesses to do certain things. Indeed, I just received an email from a financial newsletter titled "What Does Global Warming Have to Do with Energy Stocks?". And there are global carbon ETNs. And last but not least - if global warming advocates are right - the natural systems on which our economy relies are at stake.
Carbon trading is a scam. But soot can be reduced COST-EFFECTIVELY, which not only will do a lot in regards to climate (if the world is warming - see Project Mayhem's writings), but will also be good for the health of those who live in China, India and other areas getting mugged by the gunk.