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Ocean Heat. Three independent analyses show that the amount of heat stored in the ocean has increased substantially since the 1950s. Ocean heat content not only determines sea surface temperature, but also affects sea level and currents.
Sea Surface Temperature. Ocean surface temperatures increased around the world during the 20th century. Even with some year-to-year variation, the overall increase is clear, and sea surface temperatures have been consistently higher during the past three decades than at any other time since reliable observations began in the late 1800s.
The North Atlantic (surface) warming reversal is a funny feature linked to ... you've guessed it... more heat:
Care to point out that Mini Ice Age in the 70ies?
There are ominous signs that the Earth’s weather patterns have begun to change dramatically and that these changes may portend a drastic decline in food production – with serious political implications for just about every nation on Earth. The drop in food output could begin quite soon, perhaps only 10 years from now. The regions destined to feel its impact are the great wheat-producing lands of Canada and the U.S.S.R. in the North, along with a number of marginally self-sufficient tropical areas – parts of India, Pakistan, Bangladesh, Indochina and Indonesia – where the growing season is dependent upon the rains brought by the monsoon.
In addition, the crisis of 1973-74 had four immediate causes:
Poor weather conditions in many parts of the world. These began with the devastating cyclone that hit Bangladesh in November 1970; and were followed by the impact of a long drought in the Sahel region of sub-Saharan Africa, the partial failure of the Soviet winter cereal crop in 1972-73, and serious floods in northern India
A substantial increase in fertiliser prices. This was partly due to the behaviour of a notoriously "pendulum" industry, and partly to Morocco's decision to seek to improve its earnings from rock phosphate (a key compound constituent of fertiliser) by trebling its price between January and July 1974
A huge increase in oil prices. The price of oil rose by nearly 450% from October 1973 to May 1974. The trend started with Opec action around the time of the Yom Kippur/Ramadan war in October 1973, but it merged into an all-time bull-market that rapidly affected the economies of many "third world" countries as they struggled to pay for oil imports
The partial failure of the green revolution. Many of the new miracle-plant varieties were indeed remarkable, but they depended on the ability of the farmers growing them to afford the fertilisers, pesticides and adequate irrigation that they so often required. When prices of fuel and fertiliser were high, the miracle-plant varieties were starved of precisely those inputs needed to maximise yields.
Global Warming and Atlantic Currents
According to an unpublished survey by Potsdam University researchers Kirsten Zickfeld and Anders Levermann, expert scientific opinion varies widely on the likelihood that excess freshwater runoff from the Arctic will alter the North Atlantic conveyor belt in this century.
Some scientists consulted for the survey said there is no chance that the current will break down. Others estimated that the chance of a complete shutdown exceeds 50 percent if global warming climbs by 7.2° to 9° Fahrenheit (4° to 5° Celsius) by 2100.