Care to point to the scientific demonstrated evidence that the food chain is collapsing? We are much more people today when we were in the 50ies yet we are doi

Care to point to the scientific demonstrated evidence that the food chain is collapsing? We are much more people today when we were in the 50ies yet we are doing much better. So once again besides all the speculation what can you prove? I don't care about speculations i was asking about demonstrated evidence.