evidence: - The magnitude and rate warming over the last 150 years far surpasses the magnitude and rate of changes over the last 24,000 years. "This reconstruction suggests that current temperatures are unprecedented in 24,000 years, and also suggests that the speed of human-caused global warming is faster than anything we've seen in that same time," said Jessica Tierney, a UArizona geosciences associate professor and co-author of the study. [...] The team created maps of global temperature changes for every 200-year interval going back 24,000 years.