See: en.wikipedia.org/wiki/File:Greenhouse_Gas_by_Sector.png
Step 1: Collect Nitrous Oxide in giant tanks. Step 2: Store the Nitrous Oxide Step 3: Get $$$ from CO2 market Step 4: Use portion of money to buy 30 year government backed securities to cover maintenance of the tanks/land. Keep the rest as profit.
The key is to get your storage/transportation to a minimum. High compression, or piped to the ocean floor, maybe.
While carbon trading may not be a solution for global warming, it is one of the few models we have for using market incentives to curb carbon emissions in the short term.
With a simple tax everyone pays, when it get's complex those who understand the system pay far less.
http://www.carbontradewatch.org/pubs/carbon_neutral_myth.pdf
It's been a while since I read it through but their basic point is that carbon credits are to the environment what indulgences were to the mediaeval church.
PS: great comparison, I'll steal it for my own arguments. With your permission of course.
Not my comparison, so go ahead. The PDF I linked to was interesting because I'd always wondered if carbon trading (in all its forms) helped much, and the answer seems to be "no".