Earth is estimated to be at about 0.73 on ... When you think in terms of the Kardashev scale, it becomes obvious that the Sun is the most overwhelming source of energy, and everything else is ...

If Earth isn't the only planet capable of supporting ... The idea is that before a civilization can make it very far along the Kardashev scale of intelligence, it hits a wall — a filter ...

He ties his solar vision to the Kardashev Scale, which categorizes civilizations by energy use. Musk points out humanity hasn’t even achieved Type I, where Earth’s resources are fully utilized.