This has F-U-D written all over it. Yes, we might need 2.75 Earths worth of *some* minerals or resources, such as tungsten or cork trees, in 20 years, but we certainly do not need 2.75 Earths worth of other, vaster resources, such as breathable air or silicon. To say that we'd need two Earths in order to quench our ravenous thirst for light bulb filaments is overkill, and certainly does more to make me discount these studies than think poorly of how humanity manages the resources we have.

Let me guess... Random!.. No, wait, too obvious. Encrypted!