I like a lot this ANFAVEA chart showing how the domestic market consumed ethanol over the last 3 decades. It shows how the vehicles produced in Brazil were flexi-fuel and it is possible to connect the dramatic drop in alcohol powered vehicles from late 80s to early 2000 to the lower oil prices in the same period.
When the oil prices were quite high, investing in renewables was quite interesting. But when "cheap oil" was available, the consumption of renewables was disencouraged, even in cases such as the Brazilian ethanol production (first led by the Military Dictatorship Gov).
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