The human population has already grown too large and demanding for Earth to sustainably support at current consumption levels, a new study warns. Based on more than two centuries of population data, a team led by Corey Bradshaw of Flinders University in Australia found humanity is living well beyond the bounds of what our planet can support long-term. Ecologists describe the ability of an environment to sustain a species' population as its "carrying capacity". It's an estimate of the number of