What you're talking about is normal variances of temperatures, weather that have happened throughout history and from evidence dug up frequently has been going on as long as time. It's been much warmer over the course of thousands and tens of thousands of years and much colder. Both long before there were any numbers of people running around.

"Climate" changes can only be measure of very long periods of centuries or more. In the Middle Ages they had temperatures that were considerably warmer leading to increased crops, better standards of living for the day, etc. followed in the 200 years + of some very cold decades what are sometimes called "the mini-ice age". Neither can be traced back to anything people were doing.

In the 1960's we heard a similar drumbeat of "pollution is leading us to another Ice Age." Meaning, "we're all doomed unless we all do exactly what 'they the experts' tell us we 'must' do to change your [our] ways." Then they found it was getting cold, but warming a fraction of a degree avg. over the past century. Wow, now they've changed the drum beat to ""pollution is leading us to global warming...we're all doomed unless we all do exactly what 'they the experts' tell us we 'must' do to change your [our] ways."

Cleaning up air, water and land to make it better are good goals, if it's just for that purpose. What's being hyped with this latest globalmedicine show is 99% political fertilizer and 1% science.