This article is long and slightly technical, but it probably does about as good a job of summarizing a fairly complex issue as can reasonably be done.
First of all, what we already HAVE been doing since roughly the Carter era is making decisions that hurt our economy and while they MAY help OUR emissions, end up hurting world net emissions (stopping nuclear, developing less coal, failing to do oil shale):
Cut to the chase. We rich people can’t stop the world’s 5 billion poor people from burning the couple of trillion tons of cheap carbon that they have within easy reach. We can’t even make any durable dent in global emissions—because emissions from the developing world are growing too fast, because the other 80 percent of humanity desperately needs cheap energy, and because we and they are now part of the same global economy. What we can do, if we’re foolish enough, is let carbon worries send our jobs and industries to their shores, making them grow even faster, and their carbon emissions faster still.So, most of our energy saving efforts shoot both ourselves and the world emissions in the foot. But, as the liberals often say, "you have to do SOMETHING" -- they nearly always prefer counterproductive action to a relatively benign status quo. It is just the way they are wired.
The oil-coal economics come down to this. Per unit of energy delivered, coal costs about one-fifth as much as oil—but contains one-third more carbon. High carbon taxes (or tradable permits, or any other economic equivalent) sharply narrow the price gap between oil and the one fuel that can displace it worldwide, here and now. The oil nasties will celebrate the green war on carbon as enthusiastically as the coal industry celebrated the green war on uranium 30 years ago.
Thirty years ago, the case against nuclear power was framed as the “Zero-Infinity Dilemma.” The risks of a meltdown might be vanishingly small, but if it happened, the costs would be infinitely large, so we should forget about uranium. Computer models demonstrated that meltdowns were highly unlikely and that the costs of a meltdown, should one occur, would be manageable—but greens scoffed: huge computer models couldn’t be trusted. So we ended up burning much more coal. The software shoe is on the other foot now; the machines that said nukes wouldn’t melt now say that the ice caps will. Warming skeptics scoff in turn, and can quite plausibly argue that a planet is harder to model than a nuclear reactor. But that’s a detail. From a rhetorical perspective, any claim that the infinite, the apocalypse, or the Almighty supports your side of the argument shuts down all further discussion.
So BO has promised to do carbon taxes and "invest" 100's of Billions in wind and solar. The 3rd world is doing coal for 3 cents a Kwh. Wind is 15 cents, Solar is 30 (when the wind blows and the sun shines) -- so even though we have no path at all to getting to the capacity that we require, we would be paying 5 and 10x as much for energy as the folks we are competing with IF we could get it that way (which we can't). Want to make a bet what is going to continue to happen to our jobs? We are going to pay other Americans inflated government salaries to hamstring us with a sunk-cost in ultra expensive energy for decades to come. Our major ongoing cost of production, communication and even entertainment is going to be 5-10x that of our competitors. I wonder who wins at that game??
Shoveling wind and sun is much, much harder. Windmills are now 50-story skyscrapers. Yet one windmill generates a piddling 2 to 3 megawatts. A jumbo jet needs 100 megawatts to get off the ground; Google is building 100-megawatt server farms. Meeting New York City’s total energy demand would require 13,000 of those skyscrapers spinning at top speed, which would require scattering about 50,000 of them across the state, to make sure that you always hit enough windy spots. To answer the howls of green protest that inevitably greet realistic engineering estimates like these, note that real-world systems must be able to meet peak, not average, demand; that reserve margins are essential; and that converting electric power into liquid or gaseous fuels to power the existing transportation and heating systems would entail substantial losses. What was Mayor Bloomberg thinking when he suggested that he might just tuck windmills into Manhattan? Such thoughts betray a deep ignorance about how difficult it is to get a lot of energy out of sources as thin and dilute as wind and sun.
It’s often suggested that technology improvements and mass production will sharply lower the cost of wind and solar. But engineers have pursued these technologies for decades, and while costs of some components have fallen, there is no serious prospect of costs plummeting and performance soaring as they have in our laptops and cell phones. When you replace conventional with renewable energy, everything gets bigger, not smaller—and bigger costs more, not less. Even if solar cells themselves were free, solar power would remain very expensive because of the huge structures and support systems required to extract large amounts of electricity from a source so weak that it takes hours to deliver a tan.There is some complexity here, but the bottom line, as in most things where the BO position is followed is "we're screwed".