Matter cannot be created, just reformed. There were 100,000 humans at one point and now there are 7 billion. All that matter came from somewhere. To be fair, we

Matter cannot be created, just reformed. There were 100,000 humans at one point and now there are 7 billion. All that matter came from somewhere. To be fair, we have killed a lot of animals but also created a lot more in the form of farm animals. It seems reasonable to me that this is unlikely to be sustainable even if we found a way to send humans off planet. Maybe that missing magnesium gets pulled out of the soil into crops, then into our bellies, and then into a wooden box that sits as far away from our arable land as we can get it. I of course have no scientific background or idea what I’m taking about, just a fun pop science theory that came to mind when reading this.