Gerard Roe, of the Earth and Space Sciences department, recently published a paper on glacier retreat as evidence of regional climate change. Gerard says, “because of their decades-long response times, we found that glaciers are actually among the purest signals of climate change.” This method uses a signal-to-noise ratio that relies on observational records for glacier length, local weather, and the basic size and shape of the glacier, but does not require detailed computer modeling. The technique could be used on any glacier that had enough observations.