No but......
Sustainable agriculture means PERMACULTURE. I've been practicing it for years, and I have loads of time to "surf the internet, read a book, watch a movie, or visit with friends"...... in fact I have way more time than when I WORKED!
Sustainable agriculture means working smarter WITH nature rather than against it. Whenever I see images of those poor buggers in Africa toiling totally depleted soil with no water, I feel grief..... the third world's best aid would be teaching them PERMACULTURE. There is no other future. Just google the term "greening the desert"