My last word on the topic: how reasonable is it to assume that by studying, at best, 100 years of data (which may have varying degrees of accuracy) that we're smart enough to accurately predict what the next 10-50 years hold for an ecosystem that is, in fact, billions of years old? No one, I mean NO ONE, wants polluted water, air, soil, etc. - let's all agree on that at least. But, stating with absolute conviction that 'in 12 years the earth will end/pass a tipping point/etc.' is beyond preposterous. Let's all look at a minute of trading on the NYSE and declare, with absolute certainty, what the market will look like in 10 years. And anyone who dissents is a 'denier of science'. That's what we're asked to believe.
I totally believe that the climate is changing. I believe it has been constantly changing for billions of years. With very limited lifespans compared to the Earth, how can we know whether what we're experiencing is a very small section of a 10,000 year (or more) cycle or not? Does human activity affect the environment? I would think so. But, does it affect it on the same level as subtle changes in the Earth's tilt/rotation or sunspot activity or any number of the literally hundreds of factors that could affect climate? I don't believe there is any possible way to conclusively determine that. It's like solving 4 simultaneous equations with 42 variables - it's just not possible, imo, to arrive at an absolute conclusion such that there is no room for debate or second opinions.
Finally, I've got no problems with renewable sources and nuclear eliminating the need for fossil fuels altogether as long as economic progress continues. Poverty, disease, starvation, lack of potable water, etc. will surely kill more humans in the next 20 years than anything to do with climate change. The hysteria surrounding the issue with some completely arbitrary deadline of 'point of no return' is not based on anything other than a political agenda.