This could be a valid explanation of the current period of greenhouse gas increases. The rise of greenhouse gases correlates pretty well with a dramatic increase in the human population, and if there is one thing that all humans have in common, regardless of their other differences, it is gas! So let's just give everyone a free supply of simethicone, and the problem should go away. Follow the Read link to see the C-Span video clip.
[Source: ThinkProgress - thanks to Jules for the tip]