Science ... it’s Whatever.
Of course, he's a party loyalist, hence he appointment. It's how the regime rolls...look at Susan Rice, among many examples.
The Earth has been getting warmer or colder for 4,000,000,000 years. The only constant in Earths environment is change. It will continue to change till it’s consumed by the Sun.
Man has been on earth .00075% of Earth’s age or 300,000 years.
Earth will continue to change after man is long gone.
The universe is dynamic. Suns supernova, galaxies collide, planets are formed and lost in black holes daily.
Man is merely a brief observer, not the cause.