I am not confident that anyone believes in 'climate unchange'. Certainly everyone I have spoken with believes climate does change, and has throughout prehistory, long before the theory of anthropogenic influence was proposed.

Therefore theories of why climate changes need to incorporate the mechanisms whereby climate has changed before our potential influence on it began, and AGW alarmists utterly neglect to do so. Conflating an increase in CO2 well below known prehistoric levels with existentially harmful climate change is insuperable from extant data. Such moderate increase in CO2 is not associated with climate changes in the past, and in fact, CO2 is shown to be a driver of climate change only when extraordinary vulcanism occurs, such as the Siberian Traps, that are estimated to have released 170 thousand billion tons of CO2 over a 1 million year period.

This is far more than humanity will ever release.

Using data from a site that strongly advocates the AGW alarmist propaganda,the current global production is 34 billion tons of CO2 from anthropogenic sources (36 - 2). Per that level of CO2 production, it will take 5000 years to effect the harm the Siberian Traps did to the climate, and expecting current technology and CO2 production to continue unaltered during that time is utterly unreasonable.

Carbon is extraordinarily valuable, highly undervalued today, because it is the basis for life itself. We are carbon based lifeforms, and so is all life on Earth. CO2 is the base on which all photosynthesis and ecosystems dependent on it rests, and all evidence shows that up to about an order of magnitude higher CO2 levels than today's photosynthetic plants benefit from increasing levels of CO2. As the greening of the globe reveals, the natural biosphere of Earth is benefiting from our CO2 production today, and will for a long time.

I must refute the claim that a measurable increase in CO2 well below prehistoric levels that did not effect climate change is proof of climate change.

Thanks!