Apple includes their suppliers, retail stores, offices, and customers' product use in their carbon footprint (in addition to data centers) [1]:
When we measure our carbon footprint, we include hundreds of suppliers, millions of customers, and hundreds of millions of devices. And we’re always looking for ways to make the biggest difference in five major areas: manufacturing, product use, facilities, transportation, and recycling.
Edit: Correction by 3 orders of magnitude because of multiplication error :)
Then lets do a back of the envelope calculation for energy consumption for Apple's aluminum use.
Very roughly Apple sells ~25 million macs and ~200 million iphones per year. Again lets assume that it needs 2kg of aluminum for macbooks and 100g for phones (not all iphones are aluminum and this might be lower), that makes ~70 thousand metric tonnes of aluminum.
Modern smelters use 13KW/h to produce 1 kilogram of aluminum, but their production involves recycled aluminum (and possibly shavings from milling?) so number should be lower, lets say it is 10KWH per kilo.
This makes 70M*10KWh = 700GW/h year
Google's datacenter energy consumption, is difficult to guess, if there are 1 million servers, and assuming each server consumes 10KWH per day, then it makes ~3.5 TWH per year.
This is apples to oranges of course, aluminum vs server running energy costs, but still kinda implies that Google uses more energy, at least directly.
> Google's datacenter energy consumption, is difficult to guess, if there are 1 million servers, and assuming each server consumes 10KWH per day, then it makes ~3.5 TWH per year
FWIW, the linked article mentions
> The 5.7 terawatt-hours of electricity Google consumed in 2015 “is equal to the output of two 500 megawatt coal plants,” said Jonathan Koomey
The question is whether Apple's products affect the amount of aluminum extracted. If it does, then that aluminum's footprint belongs to Apple.
Likewise, you couldn't just keep buying big batteries from third parties to power all your needs, and claim to have no carbon footprint because you didn't make the batteries.
When we measure our carbon footprint, we include hundreds of suppliers, millions of customers, and hundreds of millions of devices. And we’re always looking for ways to make the biggest difference in five major areas: manufacturing, product use, facilities, transportation, and recycling.
[1] http://www.apple.com/environment/climate-change/