This is green as in environmentally friendly, rather than any pretense to color. Microbes in a Kangaroos' digestive tract produce less of a potent greenhouse gas than do those of other grass munching animals, like cows.
American comedian Louis CK let loose a blast on farts some time ago on The Daily Show with Jon Stewart. It was a ripping good riff on farts and farting, it got some attention, so end of story, right? Wrong - it has returned.
An 11-year-old boy in Ohio gets in trouble after letting one too many farts rip on his school bus. The driver was anything but amused and decided to take swift action to stop any more deadly wind from letting loose out of the boy's nether regions.