All the biodiesel stories seem to have a deep negative side. It is not particularly high-tech. There needs to be an edge - low labor costs, free feedstock, government subsidies,...
Here is one angle:
“The paramilitaries are not subtle when it comes to taking land,” said Dominic Nutt, a British specialist with Christian Aid who recently visited Colombia. “They simply visit a community and tell landowners, ‘If you don’t sell to us, we will negotiate with your widow’.”
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