Time for Bovine Tailpipes?

A recent article in National Geographic Online states that dairy cattle are responsible for 40% of the "greenhouse gases" released in California's Central Valley. Does this mean that soon all cattle will be required to have tailpipes with catalytic converters? Actually the article stated that most of the methane released was from belching, not farting. What the article didn't mention was that many dairy farms have moved to the Valley from SF and LA suburbs because they land they previously occupied became so valuable for subdivisions that the farms took the money and ran to the Valley, buying tracts of land, building new dairys and still pocketing a handsome profit.

Of course, the article approaches global warming as fact, also. I still am not convinced. When I was in my late teens/early 20s, scientists were screaming about a coming ice age. Now they are claiming the ice is melting and we are going to fry. Well, maybe a slow boil would be a better analogy.

Maybe it's time someone considered the idea that the Earth goes through cycles, and there is nothing we can do about it.