* 1 billion in 1804 * 2 billion in 1927 (123 years later) * 3 billion in 1960 (33 years later) * 4 billion in 1974 (14 years later) * 5 billion in 1987 (13 years later)
Climate change causes notwithstanding, the human impact on the animal kingdom is indisputable.
But know this, there is no going back.
Concerns for the environment are not (just) about how pretty it is to look at, at the bottom it is about liveability - for humans.
Sure we care about pristine mountain streams being good for fish to spawn in, but in reality the concern is that the fish will still be there for us to eat.
We are pushing 7 billion people now. The environment supported lots of critters a hundred years ago when there were fewer than 2 billion people, but now we have five billion more! That's five BILLION more mouths to feed, butts to poop, and to house, warm, and entertain.
The only way for us to return to a world of plenty is for 5 billion people to die.
That isn't going to happen voluntarily, but it will happen, and it ain't gonna be pretty.