BBC Earth A journey from the heat of the tropics to the planet's frozen poles; life has spread to almost every part of the ocean, but there are many different worlds within it and each presents unique challenges. 2026-04-02 Trapped by ice, Andy and Kate must cut a new trail to the outside world; Erik struggles to make opportunities count. 2026-04-02 Nominations for the Earthshot Prize to Fix Our Climate are revealed as Prince William, Sir David Attenborough and Christiana Figueres, who led negotiations for the Paris Agreement on climate change, highlight inspiring solutions. 2026-04-02 Animals fight to survive extremes, from tundra to deserts, mountain summits to deep underground. 2026-04-02 Exploring the worst mass extinction the planet has ever seen, when as much as 90% of all species died 252 million years ago; this moment in Earth's history took life to the brink, wreaking havoc and destruction on an unprecedented scale. 2026-04-02 Alaskans must adapt to new obstacles to survive in deep winter. 2026-04-03