Biofuels Dilemma

The attempt to 'grow' our way out of a dependence on fossil fuels for motorised transport by producing subsidised ethanol from corn (in the US) or biodiesel from plant oil-rich crops (such as palm in South America or SE Asia) is becoming highly contentious (http://www.guardian.co.uk/environment/2011/may/31/biofuel-plantations-africa-british-firms) with there being increasing concerns that the practice is making food unaffordable to poor people in some countries (e.g. Guatemala). The UK is apparently a key player in buying up land in Africa for biofuel production. Even in land where it is difficult to grow food crops, the planting of oil producing plants (such as Jatropha curcas) needs water, fertiliser and human effort. Much of the problem seems linked to the 'ownership' of much of the land being in the hands of large organisations. Perhaps we need to change our modes of transport or to move more decisively to obtaining biodiesel from marine algae?