TG Daily: The circulation of water in the Atlantic Ocean reversed its direction less than 20,000 years ago, a study has found. Nowadays, warm currents such as the Gulf Stream travel from the tropics to the subpolar North Atlantic, where they cool. Crucially for the world’s climate, they bring warmth with them. But according to researchers led by the Universitat Autònoma de Barcelona, things were very different in the past. The team investigated the distribution of isotopes in the Atlantic Ocean. These…