SaaS and protection of environment

We have discovered recently an interesting view on advantages of using SaaS software – see article «SaaS v. on-premises Software: Which One is More Green?».
The author claims (with numbers and calculations) that using SaaS solutions in your business help you reduce global energy consumption.
We never thought about this aspect of on-demand computing but we found it encouraging – we do useful things in terms of our global environment protection!