Well the oceans are raising, the temperatures are no longer hot or cold, they are becoming warm instead of varied.
Off the coast of Greenland, in a mass of air and water between Iceland, there is a COLD PUMP that circulates and draws the warm air up from the gulf stream. As the air comes up the coast of eastern US, it is cooled and sent back down in a circulating, convection pattern. There are many of these PUMP systems around the world that keep the cold areas cold, and the temperate areas temperate.
Anyway, the earth goes through these ice age, and temperate cycles every so many 10,000 years, with tiny warm ups and cool downs in the temperate times. In 1776 during Washington's battle (crossing the Delaware) and in Battle of 1812, were some of the worst weather conditions for war. These happended during those cooling times.
When these pumps get messed up by temperature change, through global warming, the temperatures in all areas of the earth get warmer, changing the average global temperature to a more even, cooler temperature. Global warming is a misnomer, it will actually cause the earth to cool.