New Delhi, Sept. 30 -- Cows and the industries that depend on them are on very rough terrain. The beef and dairy sectors need to start paying far more attention to the environmental and obesity impacts of their products and production processes. If they don't, they will face declining fortunes and irrelevancy. Yet that's a fate they can begin reversing now if they take the right steps.

The trends are ominous. Environmental activists have been pointing out the brontosaurus-sized carbon footprint of eating small amounts of beef, comparing it to the minuscule atmospheric impact of plant-based alternatives. Upstart companies like Impossible Foods and Beyond Meat have developed great-tasting and wildly popular burger substitutes.

The beef indu...