Overpopulation is the biggest threat to the environment (not to mention poverty and unemployment). So why is it that progressives are doing almost nothing about the high fertility rates in the world? They say having fewer children is important but that is all it is just words. Do you really think all those people in India or Africa are going to stop having so many children just because you are telling them? And where are all the campaigns and advertising telling them to not to have so many babies? Progressives are doing nearly nothing about this problem! It is almost as if they actually want more people, but then want everyone to be forced to accept lower standard of living, to "do their part" for the environment. Some readers here might make the argument that this is all in other countries, and there is nothing you can do. But these peoples children will come as immigrants into the developed countries, as all that overpopulation is creating poverty that is displacing people from the countries with high fertility rates into the countries with lower fertility rates. So if these people have a right to enter into our countries as immigrants, we should also have a right to intervene in the countries from which they are coming from, to promote lower fertility rates.