Dear Jazz: I agree with you that climate change is not due entirely to human activity. But given the very disagreable effects global warming may well cause, carefully planned efforts to reduce CO2 and methane emissions seem like good sense. The operative phrase is carefully planned. There has been a lot of nonsense such as government grants for efforts to reduce cow flatus. Keeping cows' intestinal flora optimal for low flaturulence would require an unreasonable amount of labwork and treatment. And if it comes to that, I find it hard to believe that total human flatus does not greatly exceed cow flatus. Who wants the job of controlling the human output?