[count-your-change]

I’d guess that pond scum quality would be less but growing enough to make a real difference is going to be difficult.
Making oil is easy, making enough at reasonable costs isn’t and scaling a small scale project wayyy up has another set of problems.

[dennisw]

-Can you imagine how laborious and energy intensive it will be to dry out that pond scum enough to be processed (refined) into petroleum byproducts