A new report published in the journal BioScience warns that "Earth's climate system is moving deeper into uncharted territory," with seven of 16 climate-related planetary vital signs now at record extremes. The study, co-led by Dr. William J. Ripple of Oregon State University and Dr. Christopher Wolf of Terrestrial Ecosystems Research Associates, describes the situation plainly: "We are witnessing the rapid destabilization of the Earth's climate system. This is no longer a warning for the future; it is a diagnosis of the present."
The vital signs tracked in the report span greenhouse gas concentrations, temperatures, the oceans, ice, Earth's energy balance, and wildfire. The authors also track indicators of the human activities driving these changes, including energy use, food production, economic growth, and land-use change. Together, these metrics provide a sweeping view of Earth's changing climate, as well as its consequences and causes.
The authors report that concentrations of carbon dioxide, methane, and nitrous oxide all reached record levels again in 2026. In May 2026, atmospheric carbon dioxide exceeded 428 parts per million, roughly 50% above pre-industrial levels and generally higher than any time in the last 2 million years. Fossil fuel consumption rose by 0.9% in 2025, with oil, coal, and gas all reaching record highs, and annual energy-related carbon dioxide emissions surpassed 41 gigatons for the first time.
The authors note that the rate of global warming appears to have accelerated, from about 0.05°C per decade between 1880 and 1970 to about 0.36°C per decade between 2010 and 2024. "At current rates, 2°C above pre-industrial levels could be reached before 2050," they write. According to preliminary data, say the authors, glacier thickness and Greenland ice mass are at record lows, while ocean heat content and sea level are pressing record highs.
The report documents the growing human toll of extreme weather over the past year. In October 2025, Hurricane Melissa caused 95 deaths and more than US$12 billion in damages across the Caribbean; in November 2025, a tropical storm and monsoon rains in Indonesia caused 708 deaths; and in June 2026, a severe heatwave in Europe caused approximately 14,000 deaths, according to a preliminary estimate. "All of these events were at least partly attributable to climate change," the authors note.
The authors also highlight escalating risks from climate tipping elements, including a weakening of the Atlantic Meridional Overturning Circulation and increasing vulnerability of the Amazon rainforest, where "the combined effects of warming and deforestation could push it past an irreversible threshold at just 1.5°C–1.9°C of warming." They caution that "continued warming and interacting feedbacks may increase the risk of a self-reinforcing 'hothouse' trajectory characterized by weakening carbon sinks, accelerating ice loss, ecosystem degradation, and additional greenhouse gas release."
Despite these worrying trends, the report points to encouraging signs of change. Low-carbon sources provided roughly 43% of global electricity generation in 2025, and solar and wind energy consumption grew by approximately 18%. "In 2025, for the first time in more than a century of coal-dominated electricity generation, renewable energy sources (solar, wind, hydropower, and other renewables) have surpassed coal globally, marking a potentially historic turning point in the transition toward clean energy," the authors write. Still, the authors stress that growth in energy demand meant renewable expansion "was insufficient to displace fossil fuel consumption."
The report argues that cutting emissions remains essential, but it must now be accompanied by rapid adaptation.. The authors highlight "fast-track" measures that reduce near-term risks while delivering co-benefits: "mangrove restoration can offer protection against storm surges while enhancing carbon sequestration; shifts toward plant-based diets can reduce the risk of climate-related food system instability while increasing soil carbon and reducing pressure on biodiversity; and distributed solar can reduce the risk of storm-related grid failure while increasing energy security."
The authors stress the importance of transformative change and collective action, pointing to the emergence of "positive social tipping points." They note that "even relatively small actions, when multiplied across communities and institutions, can contribute to broader societal change and help strengthen public support for climate mitigation and adaptation efforts."
Ripple, Wolf, and colleagues emphasize that climate change is also a matter of justice: "the communities least responsible for historical emissions, particularly in the Global South and small island states, are bearing disproportionately severe and early consequences." Yet they maintain that "the future trajectory of both the climate system and human societies has not yet been fully determined. The decisions made during the coming years will strongly influence whether future generations inherit a planet with an unstable climate system or a more resilient and sustainable world."
The full report is available in BioScience.
