Say good-bye to gas altogether by converting your ride to run entirely off a hoodful of rechargeable battery power. Many different car models can be modded-check out austinev.org for instructions, help finding parts, and listings of electric vehicles for sale.
Biodiesel not eco-friendly enough for you? Head to vegmyride.tv to learn how to modify your engine so that it runs purely on even cheaper and quieter-running recycled cooking oil. It´s easier, too: To fill up, just head to a fast-food joint when the fryers are being cleaned out.
Agriculture is broken. Traditional techniques use too much energy and produce too little food for our growing planet. One fix: skyscrapers filled with robotically tended hydroponic crops and lab-grown meat