I am in the heating and cooling business.In regards to climate change its pretty well the same as designing a system that is commercial rather than residential.Our earth wasn't designed for billions of people and billions more in livestock shedding BTUs and methane gases into the atmosphere.If I have a party and there are 5 guests in my great room and I want to cool the room I factor that into the design.Now if I have 200 guests in that same room the system designed for max 5 guests will not overcome the BTUs being shed by that many people.We are overpopulated and abusing the eco system in so many ways that we need to offset it somehow.Adding more BTUs ...greenhouse gases..methane gas into the atmosphere is surely not helping the problem ATM.To deny this is a problem is truly unfathomable.