A common argument for human caused global warming is "even if we're wrong and it's not mankind's fault, shouldn't we do something anyway, just in case?"
Biofuels is the perfect example of why not. Here's the chain of events: Fossil fuels, oil, is blamed for causing global warming. Since everything uses oil, government is petitioned to find alternative sources of energy. As government is wont to do, they identify a solution that is really expensive, provides massive benefits to big business, has been proven to fail in the past and has little prospects for success in the future, and will wind up hurting the poor in the end.
Ethanol and its cousins are the biofuels of choice for most of the world, including the US government. It is made from corn and other plant products. Although it was tried and failed in the past, the recent excitement over global warming has convinced our Congress to shovel money into a failed product. The current farm bill would allocate billions of dollars to biofuels, the majority of which uses corn. Coincidentally, the Senate committee head overseeing the bill is from Iowa, where 12.5 million acres of land is used to grow corn. In addition, the Department of Energy recently gave a Spanish corporation half the cost of building a $35 million biofuels plant in Nebraska.
All of this public money flowing to private coffers, and for what? A highly suspect fuel source that, according to the UN, will be catastrophic for hungry people around the world as it diverts food and land from human consumption. The riches of business and politics come at a heavy price, as the number of starving people, which now takes the life of a child every 5 seconds, stands to increase exponentially.