8) What are the various generation of bio-fuels? Why are the previous generation bio-fuels seen as threat to food security? How do 3rd generation bio-fuels manage to address those problems?

Topic: Conservation, environmental pollution and degradation;

8) What are the various generation of bio-fuels? Why are the previous generation bio-fuels seen as threat to food security? How do 3rd generation bio-fuels manage to address those problems? (200 Words)

http://www.business-standard.com/article/economy-policy/punjab-govt-plans-to-set-up-asia-s-first-bio-ethanol-refinery-115012901477_1.html