Ummmm .... This wouldn't be the first time .....

That "something better" (i.e, the solution) turned out to be worse than the original source of the problem:

Studies Say Biofuels May Increase Global Warming
London – Most biofuels cause more environmental damage than ordinary gasoline, according to a team of scientists led by a Nobel Prize winner. Since nitrogen is found in most crop fertilizers, the use of biofuels also produces nitrous oxide, a gas thought to be much more harmful to the atmosphere than carbon dioxide from fossil fuels...