How many Earths do we need to meet our population's demand?

According to Global Footprint Network, humanity is currently using Earth's resources 1.7 times faster than its ecosystems can regenerate, which is equivalent to using 1.7 Earths. According to estimates, a 7-billion-strong population would need five Earths to sustain if all live like an average US citizen. However, only 0.7 Earths would be required if everyone lives like an average Indian.