This article: Anthropogenic global warming is a huge costly fraud! by climatologist Cliff Harris, has a great deal of truth in it, and much hyperbole as well.
Yes, Anthropogenic Global Warming (AGW) is overstated by many, mischracterized in the popular press, and generally misunderstood by a poorly informed public. While this is an unfortunate error, it does not pass beyond to deliberate fraud... maybe.
There is indeed "no peer-confirmed scientific research that establishes a cause-and-effect relationship between increased atmospheric carbon dioxide and higher (or lower) global temperatures." There is, in fact, no scientific research that demonstrates the validity of global average surface temperature as a measure of climate variability
Surface temperature is just one variable in local climates. An average of all surface temperatures on the Earth gives us a number, but one which is not particularly useful in assessing variability in local climates, let alone in the speculative concept of a "global" climate.
To then take this nebulous methodology and attempt to project it forward into the future through the use of mathematical global climate models results in a product that bears almost no relationship to the reality of climate variation and is meaningless in terms of the contribution of anthropogenic greenhouse gases to that variation.
The simple fact is: We just don't know.
It's OK to not know.
Admitting our ignorance is a healthy characteristic of a well adjusted human being. To pretend that we know everything and that we can predict something as complex and chaotic as climate 100 years into the future, when we can't even predict the weather next year, is the height of folly.
The truth is, we're just going to have to wait and see.
Meanwhile, we can prepare ourselves for any climate eventuality by keeping ourselves and our societies as resilient and flexible as possible. This means not tying ourselves to finite energy sources, not building major cities and human playgrounds on shorelines subject to storms and inundation, not building on the slopes of volcanoes, active or "dormant," not building in flood plains and generally conducting ourselves as if we had learned something from 3.5 millions years of evolution.
Oh, and here's the toughy. We have to learn to control our population so as to not consume more than our planet can naturally replenish.
That's a pretty tall order. I have little confidence that Homo sapiens can pull it off.
Wouldn't hurt to try.