This would be a useful thing to lobby hosting companies on. All it would take would be to convince a dozen or two of the largest, most visible hosting companies

This would be a useful thing to lobby hosting companies on. All it would take would be to convince a dozen or two of the largest, most visible hosting companies to put sustainability/power efficiency/consumption stats front and centre on the website and the rest of the horde would be more-or-less obliged to follow suit.