I have been speaking out about overpopulation and its dangers since 1967. Negative Population Growth started in 1972, and I have been one of its 30,000+ members since 1993.
I spoke out about stopping immigration and extreme border enforcement since 1980. People thought I was a racist kook or a Nazi, because I did not like what was happening to the quality of my country. Wilderness areas I used to backpack were already getting to be not wilderness but crowds. Wages were already being affected by all the immigrants, legal and illegal, and it was costing ME.
Places I went to in the deserts, mountains, and forests, from Arizona to Washington State were getting trashed out badly.
Bad water and superfund sites to clean up after some corporations made big money and split, with taxpayers to foot the cleanup bill, were in areas I did not go to, but I knew of them. I remember when the entire southern part of Minnesota's lakes were all fished out in the early 1970s. I left, then found my old state inundated with moslems and Mexicans, instead of the high Nordic amount of people that had pioneered the state.
When I was born, there was less than half as many people in the USA, and it was a world leader (now dumbed down 5 IQ points at least). The world population has tripled since I was born, and 90 of the last 100 million of added people to my country have not been Americans or the demography of when I was born.
Overpopulation has been the elephant in the room since before Love Canal, the ozone hole, or AGW. The root cause no one wants to deal with, but we can still find humor:http://worldpopulationday.org/