The best way to raise cows sustainably? Set them free

An old farming technique called silvopasture, which allows cows to graze on a variety of plants in forests and tree-filled pastureland, is seeing a resurgence across the world

Brett Chedzoy and his wife, Maria, live on a 300-acre farm in Watkins Glen, a small town along the Finger Lakes in New York, with 100 cows - primarily Black Angus, with a few White Galloways scattered throughout the herd.

The farm, Angus Glen, has lush green pastures and wooded areas, where black walnut and black locust trees stretch skyward out of rolling seas of tall grasses, shrubs and clovers. When Chedzoy, 54, walks through the pasture at sunset, the cows pop their heads up, follow him and wait patiently at the gate. As he pulls it aside, the cows rush forward into the wooded area to nibble on tree branches and shrubs, before turning their attention to the emerald grass around the trees.