Average surface temperatures have risen half a degree centigrade since 1861.
The temperature has risen by around one degree centigrade over the last 150 years.
Bleaching occurs when sea temperatures at least one degree centigrade above normal summer temperatures are sustained for a month or more.
This means that it requires 1 joule of energy to raise the temperature of air by one degree centigrade (or Kelvin).
Some shots were taken at height of 14,000 feet above sea level and the crew shot at a temperature as low as 10 degree centigrade.
By comparison, the toe and main body bones of a warmblooded cow showed a temperature difference of less than 1 degree centigrade (roughly 1.8 degrees Fahrenheit).
(Strictly speaking, a calorie is the amount of energy needed to raise the temperature of a gram of water by a degree centigrade.)
The predictions are based on a rise in global temperatures of 1 degree centigrade by 2025.
The world has warmed half a degree centigrade over the last century.
A warmer atmosphere can hold more moisture, and globally water vapour increases by 7% for every degree centigrade of warming.
