I personally grow vermi worms and use my own urine as fertilizer. I am growing pigeon pea and plan to plant bush cowpea as a nitrogen fixing plant. Mexican sunflower for chop and drop, madre de cacao, etc. I compost our food waste. But, this will not solve all our food security needs. For instance, we still eat rice as our main staple crop here in the Philippines. It needs lots of urea. I don’t grow it.
This recent article by Michael Snyder describes the future we are facing if things don’t change fast: