The point of the work is to make the number not graspable as anything but BIG. As in, "This number is so big, you should be morally outraged".
Effective as a political statement, maybe, as long as you're already receptive to the political statement. (The artist would, presumably, be less than happy to see a map of Africa drawn out of several million copies of Silent Spring, one for every African child killed by Western environmentalists causing DDT to be de-facto banned there. Bonus points: the presentation covers the fact that the factual premise of the statement I just made is controversial.)
Maybe you know more about this than me, but last I had heard, it was the use of agricultural DDT that was most condemned, whereas DDT for epidemic control was supported by, for example, WHO. The idea was that, after some years, agricultural DDT caused DDT resistance in mosquito populations. This rendered DDT for epidemic control ineffective.
Of course, the whole argument is complicated by the fact that pesticides are needed, in current practice for high-yield rice at the green-revolution scale, without which millions would starve.
Effective as a political statement, maybe, as long as you're already receptive to the political statement. (The artist would, presumably, be less than happy to see a map of Africa drawn out of several million copies of Silent Spring, one for every African child killed by Western environmentalists causing DDT to be de-facto banned there. Bonus points: the presentation covers the fact that the factual premise of the statement I just made is controversial.)