His point was valid, when looking at a cost vs benefit perspective, which he mentioned. Global reduction of overall CO2 amounts would virtually non existent vs crippling the economy of millions of people. It's not that people don't think that climate shift is a thing, it's just that the solutions that the people who most vehemently talk about it are impractical and costly. They also ignore the majority of the larger issues while tackling the smallest possible portions of it. Get the biggest return for the least input first.