The tundra of Eurasia and North America contains twice as much mercury as the rest of the world combined.
Drone footage shows an Antarctic ice crack which opened late last year. The British Antarctic Survey is to pull all staff out of its space-age Halley base in March because of the crack.
Something strange is happening to one of the coldest places on Earth. Dazzling blue lakes are blooming like summer wildflowers atop the East Antarctic ice sheet's Langhovde Glacier. And that's got scientists worried - because they've seen these lakes before.
