It's only natural

The gas bill has come in, and it's slightly less than half the size of the September bill; twiddling the figures, I've guesstimated that 100 cubic feet of natural gas escaped from my back yard every 24 hours for most of the summer. The greenhouse effect is probably minimal, but come first snow I'm probably going to complain that it wasn't minimal enough.

And I have to figure that since methane is lighter than air, it rose rather quickly; certainly it didn't hang around long enough to kill my lawn.