I found this article and its comments, published today, fascinating: World on course for catastrophic 6° rise, reveal scientists
Here is something to think about: Why Building Occupants Ignore Fire Alarms
The main point that I got from the article about the 6C temperature rise is that CO2 emissions are rising because more energy is being used and that now coal predominates as the source. Also that there is evidence that sinks for CO2 are becoming less absorptive, and there may even be a reversal where a sink becomes a source.
A lot of the commentators are hearing the very loud fire alarm and finding reasons to ignore it. The scientists in the article are arguing for action to prevent that degree of temperature rise and not for more taxes per se. The need is to redirect economic activity (that is human resources not mere money) to develop energy sources other than those that emit CO2. I suspect that China will be at the forefront of this and become very rich rather than be kept poor because of this redirection of effort. I can imagine a future situation where countries that have power stations that emit CO2 will be threatened with military strikes in the way that Israel current threatens Iran about its nuclear fuel reprocessing.