NASA PACE shows 10% greening
- NASA’s PACE mission is not what proved Earth got greener by about 10%. That result comes from older satellite studies NASA still highlights. - The big number is older too — one study tied roughly 70% of the 1982–2015 greening signal to rising atmospheric CO₂. - What PACE adds is finer vision: daily global hyperspectral data that can separate plant pigments and phytoplankton communities in new ways.
The viral version of this story mashes together two real things. One is an older climate result — Earth’s vegetated land got greener over recent decades. The other is a newer NASA satellite called PACE. PACE did not discover the 10% greening trend. But it is giving scientists a much sharper way to see what that greening actually consists of, and whether plants are thriving, stressed, or just changing color for more complicated reasons. (nasa.gov) ### So where did the “10% greening” claim come from? It comes from satellite-era vegetation studies that predate PACE by years. NASA has highlighted work showing that from 1982 to 2015, a quarter to half of Earth’s vegetated land showed significant greening, measured with leaf area index — basicall(nasa.gov)inental United States. That is the backbone of the “Earth is greener” claim people keep recirculating. (nasa.gov) ### Was CO₂ really most of the reason? Broadly, yes — in that older analysis. NASA’s writeup of the 2016 study says model comparisons pointed to CO₂ fertilization as the dominant driver, explaining about 70% of the observed greening trend. But that does not mean “CO₂ is good, full stop.” The same N(nasa.gov)ng brings heat stress, drought shifts, fire risk, and ecosystem disruption. “Greener” is not the same thing as “healthier” or “safer.” (nasa.gov) ### What does PACE actually do? PACE — short for Plankton, Aerosol, Cloud, ocean Ecosystem — launched on February 8, 2024. Its main instrument, OCI, is a hyperspectral spectrometer. That matters because instead of seeing Earth in a handful of broad color bands, it samples many narrow wavelengths of(nasa.gov) of ocean biology, aerosols, and clouds. (svs.gsfc.nasa.gov) ### Why does hyperspectral matter on land too? Because leaves are not just “green.” In June 2025, NASA showed PACE’s first full year of terrestrial vegetation data using three pigment classes — chlorophyll, carotenoids, and anthocyanins. Older satellite systems were mainly built around broad chlorophyll changes. PACE can tease apart additional pigments link(svs.gsfc.nasa.gov)tists can move beyond “more leaves” toward “what kind of leaf chemistry are we seeing, and what does that say about plant condition?” (nasa.gov) ### What about the ocean examples people mention? Those are real, but they are separate from the greening statistic. NASA has used PACE to show detailed phytoplankton blooms, including colorful bloom structure in Patagonian shelf waters and more recent imagery near Kamchatka. NASA also says PACE’s daily globa(nasa.gov)carbon cycling, and harmful bloom tracking. (science.nasa.gov) ### And Lake Eyre’s weird colors? Also real. In early 2026, NASA published imagery of Kati Thanda–Lake Eyre showing distinct green and reddish waters after rare flooding. The colors likely reflected differences in salinity, depth, and microbial populations. It is a striking PACE-era Earth-observation story — but again, not evidence for the long-run global greening number. (science.nasa.gov) ### So what’s the clean takeaway? The clean version is simple. The “Earth got greener” result is old and mostly comes from pre-PACE satellite records. PACE’s breakthrough is different — it adds far richer color detail, every day, across ocean and land. Basically, older satellites were good at telling us the planet changed color. PACE is starting to tell us why. (science.nasa.gov)
