What happens if you warm the Arctic… just a little?

Across Canada, Alaska, and Europe, scientists are running the International Tundra Experiment (ITEX), one of the longest-running climate studies in the Arctic. Using open-top chambers that act like mini greenhouses, researchers gently warm tundra plants by just a few degrees, then compare them to nearby control plots. Founded in 1990, the experiment has now been operating for three decades as an international research network, bringing together scientists from dozens of sites across the region.

The goal is simple but powerful: watch how plants respond as the climate warms. When do new leaves appear? When do flowers open? How and when do seeds disperse? One plant in these plots, Dryas, sends tufted seeds into the wind, making it especially sensitive to changing conditions.

ITEX is not funded by a single organization. Instead, it operates as a voluntary international network that standardizes research methods, allowing scientists to pool data from independently funded projects supported by national research agencies and institutions in the countries where the work takes place.

One of the clearest patterns so far? The tundra isn’t filling with new species. Instead, taller plants are becoming more common, while shorter plants are slowly losing ground. Small temperature changes are quietly reshaping Arctic ecosystems. With no fixed end date for the experiment in sight, this network of dozens of researchers are continuing to observe the real-time effects of climate change. Watch below to hear how it works from one of the scientists on the ground: