The oil marketing companies have embarked on a massive bio fuel expansion plan. 8But globally a debate continues to rage over the use of bio fuels and whether they in fact help bring down carbon emissions. 8Opinion has swung from one end to the other and back. The jury is still out. 8Regulatory controls are likely to come in, even in a country like India, as environmental concerns grow. 8Policies will move rapidly and bio fuel companies may find themselves in a corner. 8Find out more on what is going on with the bio-fuel industry and where is it headed. 8Which feedstocks will eventually pass muster? 8And is it too early to bet big on the bio fuel industry? Clearly the future remains uncertain as of now. For more click on Reports .