Cú Chulainn

'Geologic records have identified Climate Change as a naturally occurring cycle with glacial periods of 100,000 year intervals that are interrupted by brief, warming interglacial periods lasting 15,000-20,000 years'

Speciation is the evolutionary process by which populations evolve to become distinct species.

Fossil fuels used today formed around 370 million years ago, when CO2 concentrations were roughly 5 times higher than today, burning them releases the CO2 back in the atmosphere, inevitably leading to a similar climate to that period, although the Sun is now brighter so hotter

So although climate cycles are inevitable and not primarily due to CO2, (primarily due to solar & volcano activity instead) releasing all the sequestered CO2 from fossils dating back to 370 million years when atmospheric carbon concentrations where much higher is not a good idea.