It is relatively simple in order to be manageable within relatively simple institutional frameworks. It has to be relatively simple in order to be comprehensible to those who must allocate resources to it and ultimately to those who must approve the allocation of such resources through the political process. All this makes for a strategy which lacks the requisite variety for effective global governance. Complementary strategies Relatively simplistic strategies elaborated by one set of institutions evoke compensating strategies from other configurations of institutions. Some strategies naturally complement each other, compensating for each others weaknesses.
Some strategies take over where others leave off.
Some create the foundation and groundwork allowing others to emerge. Some strategies are deliberately designed to undermine others, competing for their resources. Some strategies are simply mutually destructive and may result in total chaos in the societies in which they emerge. For a questioner sensitive only to a particular spectrum of social or environmental concerns, the only meaningful answer will be in terms of those concerns only. Other dimensions will be completely irrelevant, if not absurd, or dangerously misguided.