lets bring this back to the topic at hand. when we live in a world where rather than providing everything for ourselves, we each contribute to society our particular skill set, and live off our share of the total skill sets of the time; to say that having as many children as we want is our right, is wrong. we make allowances for those whose demands out strip their contribution due to circumstances beyond their control, as that is compassionate, however how many children we bring into the world, ( short of cases of multiple births, triplets etc) is not beyond our control. That is a choice made. It places demands that others then need to meet. And those demands involve the usage of natural resources. Either we believe that the resources of the world are endless, and nothing that we do to our planet will harm its ability to provide an endless suply of resources, or we have to accept that limits must be placed on the demands made. If we accept the latter we need to calculate what the maximum demand that can be met long term is. What the chart shows at the start of the thread is what has been calculated to be the maximum that can be provided, and the demand that is being made. And it shows that we are demanding more than can be provided in the long term. Now if the figures are wrong, thats one thing, but we do need to consider the concept. And we need to consider what we do if/when/now that we have, exceeded the ability of the world we live in/on to provide what is being demanded in order to reach sustainability.