Controversy over Terrace heaters

"Would it make sense to heat your house and leave the windows open?" recently claimed 3 Green members of parliament (well "Députés" in French) who are currently trying to pass a law that would prohibit the use of terrace heaters in France. Needless to say that restaurants and cafés do not really share the same opinion; they argue that since the smoking ban it's the only way for them to keep smokers within their reach! Both parties use figures (CO2, watts, gas...) that do not match, of course. A very French debate... BTW, I took this photo rue du Pont Louis-Philippe, at the restaurant chez Julien, very nicely decorated.