Then we are all doomed
If we have to reduce our carbon emissions to zero, then we are doomed. Even with solar and wind, we still have to run big farm equipment on oil products. Nobody has an electric engine plus batteries that can compete with diesel or gas for big projects.
And anybody who thinks we can feed 7 billion people without mechanized agriculture has no understanding of food production. Even organic farms have to use big farm machines to make a profit. The alternative is going back to subsistence farming, where each family has to grow its own food and 95% of us have to move back to the farms. Good luck with that.
