I've been looking at the work of Dr. Shaun Marcott and his team on the "deep reconstruction" of global temperatures over the past 11,300 years. Their study, published in *Science* (https://www.science.org/doi/10.1126/science.1228026), uses a wide array of paleoclimate proxies to show that the current warming since the mid-20th century is unprecedented in the context of the past 11,300 years. While there were cooler periods like the Little Ice Age, the overall trend over the last several thousand years has been one of warming, not cooling. The claim of a long-term downward trend is not supported by this comprehensive dataset.