as more number of people carry an equally greater demand for every possible thing ,which means more exploitation.more people will eat more thus need for more food an increased food demand means using more pesticides and hence eroding the soil and polluting the underground water which is untreatable .pesticides also effects the farmers.and the list can go on.
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no that was just a intro. i just mentioned one point .i was not in a mood to write a long comment.
but thanks for commenting.
but as you said that the earth can sustain twice the population,if that happens i suppose there will be space for only us.
true,but the logic behind one child policy is reducing the rate at which the pop. increases as one thing is obvious that the no. of people living will not go down it will keep on multiplying as you can see,very soon west could as populated as east.