"The general trend in the last 4,000 years is that carbon dioxide and temperature have been moving against each other"

In this quote, Piers Corbyn is going over the relationship between carbon dioxide levels and temperature throughout the last 4,000 years. He suggests that there has been a general trend of these two factors relocating opposite directions. This might imply that as carbon dioxide levels increase, temperature level reduces, and vice versa. This declaration is significant because it challenges the commonly accepted concept that increasing co2 levels cause a boost in global temperature. Corbyn's perspective suggests that there might be other elements at play in the Earth's environment, which the relationship in between co2 and temperature level is more intricate than previously thought.