I am strictly vegan for 5 years, vegetarian for 20, 95% raw. I support local farmers where I buy 90%+ of my food, 100% of that 90+ % is organic.
I started my own hydroponic garden where I use no pesticides or herbicides, but the nutrients for the first run are not organic certified (will move in that direction after my first few successful harvests).
The future is in organically grown hydroponic vegetables. You can grow them in a vertical garden on tall as your structure can support. With natural or artificial light, in a green-house, tropical tent or just outside.
Land is destroyed by oil based fertilization, the use or herbicides and pesticides. Number one however is animal farming. It is not just cruel, but its environmental effect is devastating.
Thought I would chip in .... I am sure there are others who are interested in gardening and are environmentally conscious = vegan or at least vegetarian....