As a camel enthusiast (many years ago) this is pretty bizarre. And it's not a pleasant concept to anyone, really.
However, each camel reportedly burps out 100 pounds of methane a year, which is a lot, I guess. The EPA says it's about a sixth the amount of a car. And, it is true that our ecosystem must absorb emissions from many things besides factories and cars. I have heard more than once that cow flatulence is a significant cause of problems as well.
Somehow, "Go Green--Shoot a Camel" doesn't sound like it has traction, but with Australia's aggressive plan to slash emissions, which starts next year, it could happen.