Model points to fast release of carbon
As Earth’s climate continues to change, some scientists wonder whether these fluctuations are anthropogenic, or human-induced, ramifications of increased carbon release, or whether they are simply part of Earth’s natural carbon cycle. Since the earliest instrumental records of our planet’s climate, measured by thermometers and other rudimentary tools, begin only in the 1850s, it may seem impossible to look far enough into the past to lay this controversy to rest.