At the risk of being accused of being an abortion-supporting greenie, I will express my belief that the presence and detrimental effects of overpopulation are fairly obvious. One does not need to be an "environmentalist-wacko" to observe the strain exerted upon the world's natural resources by the present population. One does not need to be a member of NARAL to observe that the poverty and misery of much of humanity is continuously perpetuated by people having kids they can't afford to feed, educate, etc. Any American living in urban or suburban areas can observe the impact of growing populations upon their quality of life.
The issue of overpopulation in general should be considered separately from the more specific issue of declining Western birthrates and increasing Muslim birthrates.
God spoke to all nations, "Go and be fruitful." Can't really argue that point, but I don't think that is what you are trying to say.
Look at the different regions of the world differently? Is that what you are trying to say? But some environmentalists are not wanting third world countries to develop their natural resources, so that arguement wouldn't make sense.
Maybe we can't make sense out of this??????