Ray I hear you. Nobody also asks if we have enough weapons for the wars we fight but we start them anyway then find the money or borrow the money or print the money. Unfortunately, looking at the "solutions" in this article, covering 50% of the rooftops with solar panel for example requires a lot more than dollars. It requires a shit-ton of glass, aluminum, copper, rare earth, manufacturing facilities built, diesel to transport and install not to mention unprecedented cooperation between countries to manufacture, distribute and install said solar panels as we fight World War III for the remaining resources of the planet. Piece of cake! I wonder what Mr. Jacobson's preferred mood elevator is?