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I'm wary of the other letter writers hitting the claxon about over-population. Not mind you, that I have kids (I don't, nor do I want any), nor that I don't agree that over population is a serious issue. But I don't like the rhetoric, nor the insinuation that human beings are a "cancer". The reality is, across the developed world. birth rates ARE slowing down, that every country where the status of women is improved, that contraception and abortion rights are allowed, shows a marked decrease in children, and a marked increase in the quality of life for not only the parents but the children as well.
If you want to see population rates go down the single most effective way is to give control of reproduction back to those whom it should have never left; women. Get involved with your local Planned Parenthood, distribute condoms or literature about, and most importantly, don't tolerate misogyny and sexism in your day to day life. Is it any wonder that a country rife with serious issues of domestic abuse, rape, and income/job inequality is also the only one that isn't showing signs of declining birth rate.