Carbon Credits are a weird thing. Businesses can buy and sell them, and having enough carbon credits to offset your CO2 output suddenly makes you a Green Business. That being said, who issues Carbon Credits, and on what authority? Is a Carbon Credit a promise to remove an amount of CO2 from the atmosphere?
Last I checked that was a massively expensive technology still in it's infancy, but Carbon Credits have been around for quite some time. Does it work like a Futures market ("When the tech becomes available I promise to remove 30 bln tons of C02")?