Guys, Why aren't the greenies pushing for plant based Diesel over petroleum diesel?

Guys, Why arent the greenies pushing for plant based Diesel over petroleum diesel?

Rudy diesel's first diesel engine ran on peanut oil. While peanut oil would be too expensive, a blend of canola and soy would run about $9 or $10 per gallon. That would cost two or three dollars more than petroleum diesel, but you'd be saving the world. Plant based Diesel runs 80% cleaner than petroleum based.

Also, 3-5 acres of soy would run your diesel car for a year!

Question inspired by @GretaThunberg

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If the cost of diesel is what's causing food prices to rise, shouldn't the greenies rise to the occasion?
Guys, Why aren't the greenies pushing for plant based Diesel over petroleum diesel?
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