[seanwilson]

Does anyone know of any good sources of information about which web hosts are the most sustainable?

I had a quick look and didn't find an obvious resource online to study. I messaged a couple of popular web hosts and each said they don't have any specific policies on sustainability or any energy usage stats to share.

[mikro2nd]

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.

[pbhjpbhj]

You'd need a legislated standard, I fear. There are so many ways you could lie statistically and still appear to be giving good info.