Too many humans not enough resources. It's obvious that human population is the cause of some of the most devastating ecological problems facing the planet. I completely agree with Sir David Attenborough when he says that humans are a plague on the earth. This fact is proving unsustainable as the human species takes more and more for ourselves in some seemingly ignorant belief that the earth can keep giving. Burning rain forests to make way for palm oil, the unprecedented killing of wildlife such as elephants, long line fishing that leaves fish species depleted, many fragile environments and animals facing uncertain futures and it's all down to us. We are destroying our own environment in the process and in turn ourselves but we have a choice. The earth can't continue to support so many of us and David Attenborough suggests that our growth has to be limited, human population controlled. Interesting that this comes after China has lifted it's policy of one child per family. How many millions and millions of them are there already ? For the sake of the future of all species including our own something does have to done to limit population growth.