Should Earth become a planet of vegetarians?

When I saw that headline on a story in The Guardian, it was like I’d been waiting for it. It struck me as both amusing, in its implication that vegetarianism would be a tough fate even though we’d likely be healthier for it, and also as an inevitability, with which I’d already come to terms.

But the story itself is not funny.
Here was the lead paragraph:

DIY drip line irrigation – an efficient way to water your home vegetable or herb garden

Drip line irrigation is a great idea for gardeners who want to save water and grow plants successfully.

By soaking the ground with water, the drip line approach mimics the effect of a gentle soaking rain, instead of battering leaves with a harsh jet of water like so many sprinkler systems do. More importantly, by slowly delivering the water to the soil and plants and not spraying it overhead the air, a drip line system can better target, and thereby reduce, the water needed for landscape or edible plants.