The biggest threat of the old type of biofuels was threefold:- To make the biofuel one used crops of agrarian products, like maize and sugar cane, which are normally eaten to make a relative very little amount of biofuel out of it.
- The consequences were that great fields of farm land were necessary and used to grow monoculture crops for the production of biofuel instead of food. It produced a very little amount of biofuel in the form of ethanol or biodiesel, compared to its potential for the production of food. So it was a waste of farmland, but it was done because the crops produced would bring in more cash, if it was sold to produce fuel, then it would if it was sold as food.
- Then after a while local people started protests, because the prices of food, like grain and maize were becoming so high, that people could almost not or not buy them to make food or buy the food in the form of bread
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