It banned about 100 subtances, many of which, besides destroying the ozone layer, "also happen to be exceedingly powerful greenhouse gases," Justin Gillis writes.
"If production had been allowed to continue, a batch of scientific studies show, the planet would most likely be warming a lot faster than it is. The latest of these studies came out only a few weeks ago... In fact, the evidence suggests the protocol has done far more to limit global warming than the better-known treaty adopted for that purpose, the Kyoto Protocol."
Now changes to the treaty to ban some replacement gases which also are green house gases are under considertion, which leads Gillis to quote Durwood Zaelke. He heads a Washington advocacy group that is pushing for the treaty amendment, and says that "the drew a simple lesson from all this: However overwhelming global warming may seem at times, we are not powerless in the face of it."
That's worth remembering when the fight seems impossible.