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>What massive environmental impact?

The one you describe in the rest of your post. Billions of tons of CO2 emissions and the outcome is a negative burden on society rather than a benefit.

>It's the fault of the farmer that is using diesel tractors, fertilizing his plants with artificial fertilizer, shipping his food with diesel trucks.

None of those things are the farmer's fault. They are the inevitable and mandatory cost of urbanization. Were you planning to just starve while making ads?

>All of these pollution sources will have to switch to renewable energy one day

That is physically impossible. What will have to happen is techno-industrial society will collapse as we exit the tiny blip in history of abundant energy.