This heart-wrenching video of an emaciated polar bear struggling to find food on Canada’s Baffin Island is all you need to see to understand the effects of climate change. Polar bears normally feed on seals, but they have lost access to their main dietary staple as global temperatures rise and sea ice continues to melt, disrupting the entire ecosystem. The footage, captured by National Geographic photographer Paul Nicklen, gives us a very harrowing and tangible image of what climate change is doing to the planet and its inhabitants (watch, runtime: 1:08).

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