Why does the EU invest so much in biodiesel if it has a very low return on investment as a fuel?
According to a chart posted in a Skeptics question, biodiesel is the worst energy source we have in terms of return on investment:
However, every time I travel outside the city in Europe I see huge fields of rapeseed and I know that biodiesel is heavily subsidized by the EU. So what's the rationale for investing so much in such a horrible power source? Are there plans to abandon the project and switch to more efficient sources of alternative energy?