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You need to justify this point. How is an increasing third world population and approximately constant first world population going to destroy Planet Earth?
That's probably more to do with immigration than birthing rates.
As for the petrol thing: We're approximately 15 years from the point where the premium oil wells run out. After that, there are huge amounts of crappy resources; for instance when the oil is mixed in with mud or shale. The problem is that the processess to get the oil out of these are incredibly expensive, so either new processes need to be invented, or oil is going to get so pricey that no-one will be able to afford to run a petrol car.
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Last I checked it's not keeping constant but was still growing. But I guess it could be that this generation of people don't want to have as many kids as in the old days so I'm sure there's been a decline on the graph at some point.
However we're already at a point where we're killing the planet. 7 billion of us is just to many on a small planet like this. Toxins, cutting down of trees, animals going extinct, using up all natural resources, using up a lot of space for living and putting our junk in landfills and rivers.