Nature World: Many theories have been suggested to explain why the Earth is currently in a global warming hiatus, from volcanoes to air pollution to sunspots. But new research indicates that this missing heat is trapped deep in the Atlantic Ocean. Scientists from the University of Washington (UW) say that heat from the surface is plunging nearly a mile down in the north and south Atlantic, affecting the balance between incoming heat and heat radiated back into the atmosphere. Despite the fact that greenhouse...