This research is welcome and I hope it will help us save our planet.
Environmental issues are serious.
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Lemme clue you in to what is going on here:
If you own (usually through a multi-national corporation and via shell companies) a pineapple plantation in SE Asia, and it takes 200 locals to do the labor, it is 'inefficient' to support a population of, say, 2000 to a level where they won't cause problems. Further, it is 'inefficient' to have the mean IQ be much above what is necessary to swing a machete. Natural variation will give you enough of the 200 to actually run things, and paying such people and extra $1/day will make them your dedicated servants for life.
If you've traveled around at all, even just using Google Earth, you will see vast areas where there are few or no people. The planet is NOT in danger of much harm due to humans. And in places where it is, humans are more and more willing to put up with 'preservation' even when it means some sacrifice. Lots of places are actually 'going back to nature' for simple economic reasons. Most of the fear stories are well funded propaganda designed to bring in a 'technocracy' where the very people who control much of the worlds wealth today via monetary systems control even more and to a much finer level of detail.
If you read much of the background documentation from earlier in the formation of these plans, you find novels like 'Brave New World' and texts like Bertrand Russell from his "The Impact of Science on Society' of 1953:
"Diet, injections, and injunctions [a command, admonition, etc.] will combine, from a very early age, to produce the sort of character and the sort of beliefs that the authorities consider desirable, and any serious criticism of the powers that be will become psychologically impossible."
You simply cannot miss that what is happening with IQ, and a lot of other things which people like Russell describe, is a direct match. Yes, 'environmental factors' are resulting in declining IQ scorse I am sure of it. The only real question is how carefully engineered these 'environmental factors' happen to be. The more I research things, the more I conclude that it is a lot. There are a lot of plans right out there in the open for anyone who chooses to look...which is probably the biggest reason for dumbing down the population so fewer and fewer people will do just that.