I agree with the comment you'r arguing against yourself
Your quote: "Secondly if we are suffering negative health effects, how is it that our lifespans have increased over the last hundred years?
Don't get me wrong I know the climate is changing. It's that blanket statements like yours do beg for some questions. "
Last time I checked... an increase in global temperature (whether you think it's caused by human or not), or change in climate (colder, warmer, wetter, dryer) doesn't kill us. And even air pollution does NOT kill people, not in an acute way... it's a slow, very slow process. In fact for the most part air pollution itself does not kill anyone... it just makes ppl more susceptible to diseases, getting sick easier etc. On the other hands, all the modern medicine, antibiotics, vaccines, diagnostic equipments are leaps and bounces from a hundred years ago, there is no comparison at all.
And if you want to argue over semantics, I wouldn't mix in environment with health care as 1 giant thing. If I throw you in a poisoned air chamber, while giving you an antidote on site... is your overall environment (your definition) still good? You'll still be alive right? ....I think not.