Not a scam or anything

A reader writes:

I thought you'd appreciate the humor in this one:

So as I understand the logic:
- Oz Government buys into the whole global warming nonsense
- Passes law allowing people to do "green" things in exchange for "carbon credits"
- Carbon credits can be traded for cash value
- Every huckster and his brother is now coming up with "green" activities to make a buck -- like killing camels because they fart too much
Makes me want to lay off cabbage.
Bonus Quip: British people call farts "trouser coughs." I'll be working that into a sentence tomorrow for sure.