Somebody, please, kill the author of that article!

If you are green, then you should think about effectiveness of your code. I mean, how much watts your code will use. Ideal program should produce result without using of any computation at all. Programs with lazy evaluation is very close to that ideal. Y Combinator is very green in such languages. But Y Combinator in call-by-value languages? Code, which produces code, to run code, which produces new code, to run code, which produces new code, ...? Author want to boil our planet?