National Public Radio: Jellyfish and other related creatures may be playing an unwitting role in the Earth’s climate by stirring up the oceans, according to a new study in this week’s issue of the journal Nature. The findings are helping to revive a decades-old debate over whether animals in the ocean can contribute significantly to ocean mixing, the process by which warm water on the surface combines with the cold water far below. Mixing is a key regulator of the Earth’s temperature and the ocean’s …