It’s pretty clear that we’re wrecking Earth. Elsewhere, Earth Overshoot Day – the day when humanity has exhausted nature’s budget for the year – comes earlier and earlier each year. How many people could live on Earth? Well, according to BBC Earth Unplugged, there are three ways. There are 7bn people on the planet but, if we all lived the average American lifestyle, Moate explains that Earth could support just one-third of that.