Climate Change Quotes
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Almost a century later dirty vegetable oils from fast food restaurants were used in Diesel truck and tractor engines very effectively and efficiently.
This was an amazingly prescient view of the future.
The major reason for not yet harvesting waste is the labor, caital, and energy costs of recycling relative to the value of the resource is too high. Technology improvements and greater shortages continuously change the equation in favor of harvesting more and more resources.