Musk has argued for a carbon tax and characterised climate change as the second-greatest threat to humanity after artificial intelligence.
Musk was a critic of President Donald Trump's stance on climate change and resigned from two presidential business advisory councils following Trump's 2017 decision to withdraw the United States from the Paris Agreement
Musk has long promoted the colonization of Mars and argues that humanity should become a "multiplanetary species".
He has suggested the use of nuclear weapons to terraform Mars. He envisioned establishing a direct democracy on Mars, with a system in which more votes would be required to create laws than remove them.
Musk has also voiced concerns about human population decline, saying that "Mars has zero human population.
We need a lot of people to become a multiplanet civilization."
Speaking at The Wall Street Journals's CEO Council session in 2021,
Musk stated that a declining birth rate, and consequent population decline, is one of the biggest risks to human civilization.
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