In 2017 Google claims it will use ONLY renewable and green energy to power up everything from data centers to their offices around the world.
They already have very energy economic data centers, to be princess they are 50% more efficient that the world average in this industry which is pretty impressive giving the enormous computing power they need to run anything Google.
The main source of Google's electric needs comes from wind farms. Here is a graph showing how much green energy Google is buying compared with other big companies:
To be fair I didn't expect Apple to be so low on the list, Amazon is also doing a great job, but Google, well Google plans to buy its own solar panels and wind turbines and make their own energy. This is what I call thinking of the feature and acting at the same time!
Google is definitely on the right track and I don't see anything stopping them anytime soon. Not even Facebook.