I would absolutely echo everything Joël Bêty just said.
I would just like to highlight one thing.
On Qikiqtaruk—Herschel Island we've been collecting various datasets. One was the depth of the active layer. It was something that had been stopped and our research group brought it back as a long-term dataset. Then last summer, suddenly a massive permafrost thaw event happened. If we hadn't been collecting the long-term data, we wouldn't understand right now what was happening and we wouldn't be able to make predictions of what's going happen next summer and into the future.
You can't always anticipate the changes that are coming. You have different rates of change for different parameters of these systems. The impacts are global and also local, and are vitally important. We need the data to understand the change that's going on.