Yes, it is true that it exploded stronger in the U.S. than elsewhere, but it was not in the United States that it originated. The awareness of our environment came progressively in all countries with different outlets. For example, in Germany it became political very soon. In France it tried to become political and failed. Here it remained in the right place for a long time until it started to fade out.
People are still very much interested but seem to be turning their backs on the real problems.
The monumental problem for the future is overpopulation. We had hoped that the Cairo Summit would help us find solutions, to send a clear message to people. The biggest obstacle was mixing abortion with overpopulation. These are two things that have nothing to do with each other. You've pointed out that the world population was relatively stable in the millennium between the years 900 and 1900, but now population is predicted to double just within your lifetime.