With his moustache caked in icicles and frozen droplets, glaciologist Peter Neff shows his 220,000 TikTok followers a sample of old ice excavated from Antarctica’s Allan Hills. The drop-shaped fragment encapsulates tiny air bubbles, remnants of 100,000-year-old atmosphere. The greenhouse gases trapped inside carry precious information on Earth’s past climate, explains @icy_pete as he brings …

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