produce food while consuming less. yes. reporter: the success of the cross breeding will take years to measure. in california, sinton took us on horseback to see his family s plan b. a vineyard is a great source of revenue and it s a low user of water. reporter: in 1972 sinton s grandfather set aside 120 acres to grow and sell grapes to wine-makers. today the family produced their own. this is a 2019. reporter: delicious. do you ever see your plan b taking over your plan a? no, because the purpose of plan b is to generate revenue to sustain plan a. reporter: ramping in america has always been a profession of faith. we re stewards of the land. o take ingenuity to preserve this american way. what happens with livestock and the earth. for eye on america, jonathan vigliotti, cbs news, paso