Will new studies confirming global warming settle skeptics’ questions? Don’t hold your breath - Capital Weather Gang - The Washington Post

Muller has (or had) credibility in the skeptic community due to his criticisms of mainstream climate science findings. ...Hopefully the peer review process (in the broadest meaning of that term) will bolster the studies’ findings when all is said and done, and we can finally move on to the more legitimately pressing questions in climate science, such as how high sea levels will rise between now and the end of this century.

BusinessDay - Global warming farce

CO² levels in the air have averaged more than 2000 parts per million (ppm) since the Cambrian Period, 500-million years ago. They are now 390 ppm, extremely low in the life of the planet, perhaps dangerously low for most green plants. CO² is a weak greenhouse gas.
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There is nothing unusual about the slight warming of the past 150 years, neither in magnitude nor in rate of change. The Medieval Warm Period, which was worldwide, showed a similar, if slighter higher, rise more than a thousand years ago, when CO² levels were lower than now. All the evidence is that these changes are caused by changes in the sun.

In the past 15 years, while CO² has continued to climb, there has been no increase in global temperatures.

CO² simply has very little effect on the climate.