Fifty years from now, the last person on Earth, a very ethical, God-fearing man, watched as civilization crashed from overpopulation and climate change, and Earth was no longer able to support humanity. He ascended into heaven and complained to God. "Why did you abandon us? Why did you not give us the tools to deal with this calamity?" God replied, "I gave you a brain and an ability to reason; you might have made use of it."
Those who think human activity does not affect climate: Think again.
Those who do think overpopulation is not a problem: Think again
Would we have the same problems with resources we have today if the Earth's population was one billion?
It took the Catholic Church close to 400 years to clear Galileo of supporting the Copernican doctrines of a stationary Sun and a mobile Earth.
We do not have that much time.