3.5 stars rounded up to 4.
Jemma Wadham tells the story of glaciers through the framework of her own life. She takes us through her early years, her hopes and dreams, and how she sort of falls into the field of glaciology. Ultimately, we accompany her on each of the major field expeditions to glaciers in different parts of the world where her team travels to conduct studies. Through these expeditions, Wadham describes different aspects of geology, history, chemistry, etc. which are affected by glaciers and the relationship between them and climate change.
I think Wadham does a good job of speaking to a non-technical audience regarding the minutiae of her research. She provides basic background information to help readers understand the more complex questions and problems her research attempts to solve. A lot of it is very niche and specific, as one might imagine, and sometimes it is both fascinating and a bit tedious.
"Even at the bottom of Shallap valley, eight kilometres downstream from the glacier, the river waters remained highly acidic and toxic with metals, the river bright orange. This was a very different story to Pastoruri – but why? In Shallap the boundary between the metal-rich Chicama rocks and the granite of the batholith is clearly visible about a third of the way down the valley from the glacier. The Chicama generates acidic waters, but mixing with more alkaline waters flowing over the batholith ought to mitigate the acidity. The problem is, though, that the valley lacks large broad hillsides and moraines to soak up rainwater which forms neutralizing groundwater reserves; the only places where rainwater can be stored are in small, steep talus cones (from rockfall) which line the steep valley sides, or in small lakes or snow patches high up above. Tiny streams and waterfalls plunge daringly down the mountainside and into the main Shallap river, but (unlike the springs in Pastoruri valley) they are neutral to slightly acidic in their pH. Acid-consuming wetland pampas, which can absorb metals from waters, only cover a tiny area on the valley bottom. Essentially, the Shallap River cannot recover from the slug of acid input from its feeding glacier above. The concern is that many other valleys like Shallap will head this way, and the all-important local water supply will become poisoned."
The importance of the work Wadham and others in her field are doing can't be overstated. Climate change is affecting the glaciers which in turn have massive implications for the future of the planet. From a glacial perspective, climate change denial isn't even on the radar. The question is, is there still time for us to save ourselves? That remains to be seen.