And "Despite this, we again matched 100% of our electricity consumption with renewable energy purchases (on a global and annual basis) for the ninth consecutive year.". So they still *did* buy a green GWh for every GWh they spent, just not on a per-second basis. That is how they calculate emissions happening - they are using a *stricter* basis for their calculations.
Sorry, I was wrong here. Page 69 actually details where the emission figure comes from. It is not from data center energy at all. They count *all* emissions from all sources connected to the company, including employees *commuting to work* and employee business travel. Just 1% of that came from Google operations. 19% are from secondary sources (like emissions caused by drawing electricity from grid at the time when not enough green energy is there). 80% of that number is from emissions by third-party suppliers. And Google still counts that as *their* emissions.
I am not a fanboy for Google and not saying they are perfect, but one should also not pick out the numbers to present them worse than they actually are.