Alex Wolfe and colleagues have sampled and chemically analysed the layers of sediments at the bottom of lakes in high alpine zones and the Arctic.

BBC: Leaving our mark: Fossils of the future

Along with neighbouring Banff, Jasper is a Unesco World Heritage site, recognised for its beauty, animal and plant life, and staggering variety of landscapes, including glaciers, alpine meadows, steaming hot springs, cerulean lakes and some of the highest peaks in the Rocky Mountains.

BBC: Hiking to the top of Jasper National Park

We left the rocky alpine pinnacle, where a beautiful view of thick forest and tantalizing, sparkling lakes extended for miles in every direction, and began our descent.

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