....I also dont understand something. Is everyone who says that over-population is the main threat also against climate change? If so, why? Climate change could be the thing that finally gets rid of humans. I dont mind too much if several other species go as evolution will see them return at some point and they are not there for me, they are there to fill a niche. Climate change is certainly not a threat to the planet as it will still be spinning through space even under the worst climate scenarios. As long as we dont disrupt the things that really matter; plants, fungi and inverts, then life will carry on. We might not be there to see it but maybe thats no bad thing.
I think over population and Climate Change (the kind brought on by Global Warming due to Human activity) are very, very closely linked (kind of obvious really).
It's estimated that the World population by 2035 will be 11 billion, that's nearly double what it is now. Ok, many of those will be in developing countries, but as we know, it's those same developing countries which are now trying to catch up to the developed World, and making the problem of Climate Change even worse (how many power stations does China already build in a year). People in developing countries will not be happy to live as they have always done - they want the same luxuries that we in so-called developed nations have. So yes, we are to blame for where we are now, but they will make it considerably worse in the future, because they see it as their right to "catch up".
If the World population doubles in the next twenty odd years, then logically even if you reduce your carbon footprint by half in that time, the World will still be pumping out the same amount of carbon in 2035.
Also, where will all of these people live? What will they eat? Where will they work? The Earth does not have limitless resources. As the populations grow, the pressure on wildlife will grow. That's why I say that all of our conservation work will be in vain if we don't combate over population. You can call a piece of land a nature reserve, and say it's protected for ever, but if people need to live there and build houses and grow crops, they will eventually and the reserve will be lost.
And what happens after 2035? Can we expect 20 billion by 2080? 40 billion by 2150? We're talking about a time period which is within many of our lifetimes, or at least our childrens lifetimes. My youngest son is 14. What will the population be by the time he is 70 in 2064? Can you imagine the amount of muck we'll be chucking into the atmosphere by then?
Can you imagine the response any politician would get if they proposed population control (the World over, not just in the UK)? It will never happen.