Industrial Revolution

When people talk about the “Anthropocene,” they typically picture the vast impact human societies are having on the planet, from rapid declines in biodiversity to increases in Earth’s temperature by burning fossil fuels. Such massive planetary changes did not begin all at once at any single place or time. That’s why it was controversial when, after over a decade of study and debate, an international committee of scientists – the Anthropocene Working Group – proposed to mark the Anthropocene as an epoch in the geologic time scale starting precisely in 1952. The marker was radioactive fallout from hydrogen bomb tests. On March 4, 2024, the commission responsible for recognizing time units within our most recent period of geologic time – the Subcommission on Quarternary Stratigraphy – rejected that proposal, with 12 of 18 members voting no. These are the scientists most expert at reconstructing Earth’s history from the evidence...

Over the past century, the Earth’s average temperature has swiftly increased by about 1 degree Celsius (1.8 degrees Fahrenheit). The evidence is hard to dispute. It comes from thermometers and other sensors around the world. But what about the thousands of years before the Industrial Revolution, before thermometers, and before humans warmed the climate by releasing heat-trapping carbon dioxide from fossil fuels? Back then, was Earth’s temperature warming or cooling? Even though scientists know more about the most recent 6,000 years than any other multimillennial interval, studies on this long-term global temperature trend have come to contrasting conclusions. To try to resolve the difference, we conducted a comprehensive, global-scale assessment of the existing evidence, including both natural archives, like tree rings and seafloor sediments, and climate models. Our results, published Feb. 15, 2023, suggest ways to improve climate forecasting to avoid missing some...

Musical performances usually happen in concert halls or clubs, but famed cellist Yo-Yo Ma is exploring a new venue: U.S. national parks. In a project called Our Common Nature, Ma is performing in settings such as the Great Smoky Mountains and the Grand Canyon. By making music and bringing people together in scenic places, Ma aims to help humans understand where they fit in the natural world. “What if there’s a way that we can end up thinking and feeling and knowing that we are coming from nature, that we’re a part of nature, instead of just thinking: What can we use it for?” Ma mused in a recent New York Times article. There’s a buzzword for this outlook: nature-positive. And it’s cropping up at high-level meetings, including the 2021 G-7 summit in Cornwall, England and the COP15 biodiversity conference in Montreal that adopted an ambitious framework for protecting nature in December 2022. As a group of environmental leaders wrote in 2021: &...