What if trees could warn us before a deadly volcano erupts? Scientists now believe that’s exactly what they’re doing. New research shows that trees growing near active volcanoes change the colour of their leaves before eruptions happen. The leaves get noticeably greener, and this unusual glow might be the Earth’s natural warning system.

Here’s how it works. As magma rises beneath the surface, it starts releasing carbon dioxide. This CO2 doesn’t just seep out silently, it’s absorbed by the nearby trees. And when plants get more carbon dioxide, they thrive. Their leaves grow greener, healthier, and more vibrant. Scientists can detect this change using satellite tools that measure something called NDVI, which tracks how green vegetation is from space.

At Mount Etna in Italy, researchers spotted clear patterns. When carbon dioxide levels rose underground, tree leaves started greening up. And soon after, volcanic activity followed. This same pattern has been seen in Costa Rica and other parts of Central America.

Why does this matter? Because in many places, volcanoes are hard to reach or monitor directly. It’s often difficult to detect low levels of volcanic gases from space. But now, thanks to tree signals and satellite technology, scientists have a new remote tool to add to their eruption warning systems. This discovery could help save lives in areas where traditional monitoring falls short.

NASA, the Smithsonian Institution, and top universities are now teaming up to track these tree changes in volcanic regions. Not only can this help predict eruptions, but it may also reveal how trees respond to rising global CO2 levels.

Next time you see a forest near a volcano looking unusually lush, it might be more than just healthy growth. It could be nature trying to tell us something.