"We have well over 8 billion people on this planet. All ecosystems have been perturbed, and wildlife has been hugely depleted by over 70% in just the last half century. Deforestation continues apace at almost 5 million hectares per year. So, it’s impossible for all humans to live sustainably right now. If a few chose, and succeeded, to live sustainably, it would have no measurable effect on the planet."