Comment by jl6

Yes, water is a renewable resource, and like other renewable resources the thing we should be concerned about is not the fact that it’s used at all, but how and where it is used.

Water usage matters in water-stressed regions. In other regions, conserving other resources will matter more.

If you take the stance that data centers are bad because they use water, and thus your usage of data centers should be reduced, then you are likely to be optimizing the wrong thing in many cases.

Simplistic advice to delete emails to save water may well cause less efficient usage of resources whose conservation matters more.