A species of sea urchin in the Mediterranean will be able to live in our future climate-changed seas — while other animals will die as waters become hotter and more acidic. Added to this, urchins generally are known to destroy ecosystems as their numbers swell (largely due to rising sea temperatures) and are currently doing so worldwide.A species of sea urchin in the Mediterranean will be able to live in our future climate-changed seas — while other animals will die as waters become hotter and more acidic. Added to this, urchins generally are known to destroy ecosystems as their numbers swell (largely due to rising sea temperatures) and are currently doing so worldwide.