One reason decentralized markets are preferable to government central planning is that human beings are fallible. Mistakes are inevitable. Some investments will be errors. Mistakes in the market tend to be on a comparatively small scale. If one company invests in plug-in hybrids and it goes bust, only a relatively few people suffer. The assets of the bankrupt firm pass into more capable hands.
But decisions by government, especially the federal government, affect all of us. When government makes a mistake, the bureaucracy can't go bankrupt. Instead, it will use its failure to justify increased appropriations in the next budget.
If "green jobs" make so much sense, the market will create them. They will be created by private entrepreneurs and venture capitalists who are eager to profit from winning investments. The best ideas will rise to the top, and green energy will gradually replace coal and oil.
If politicians were serious about creating jobs and cleaner technologies, they would step aside and let the free market go to work