Agence France-Presse
GENEVA--Scientists have found evidence of a "drastic" shift since the 1970s in north Atlantic Ocean currents that usually influence weather in the northern hemisphere, Swiss researchers said on Tuesday.
The team of biochemists and oceanographers from Switzerland, Canada and the United States detected changes in deep sea Atlantic corals that indicated the declining influence of the cold northern Labrador Current.
They said in the US National Academy of Science journal PNAS that the change "since the early 1970s is largely unique in the context of the last approximately 1,800 years," and raised the prospect of a direct link with global warming.
The Labrador Current interacts with the warmer Gulfstream from the south.
They in turn have a complex interaction with a climate pattern, the North Atlantic Oscillation, which has a dominant impact on weather in Europe and North America.
Scientists have pointed to a disruption or shifts in the oscillation as an explanation for moist or harsh winters in Europe, or severe summer droughts such as in Russia, in recent years.
One of the five scientists, Carsten Schubert, of the Swiss Federal Institute of Acquatic Sciences and Technology (EAWAG), underlined that for nearly 2,000 years the sub polar Labrador current off northern Canada and Newfoundland was the dominant force.
However that pattern appeared to have only been repeated occasionally in recent decades.
"Now the southern current has taken over, it's really a drastic change," Schubert told AFP, pointing to the evidence of the shift towards warmer water in the northwest Atlantic.
The research was based on nitrogen isotope signatures in 700 year old coral reefs on the ocean floor, which feed on sinking organic particles.
While water pushed by the Gulfstream is salty and rich in nutrients, the colder Arctic waters carried by the Labrador current contain fewer nutrients.
Changes could be dated because of the natural growth rings seen in corals.
"The researchers suspect there is a direct connection between the changes in oceanic currents in the North Atlantic and global warming caused by human activities," said EAWAG in a statement.
Global warming, unexpected flooding, unusual rains not in consonance with normal weather pattern are offshoots of indiscriminate human activities on the planet. People have gone overboard and above the threshold of natural laws. In other words these phenomena are not natural anymore because we are trespassing the laws that Mother Nature has set for us to follow. Just an example - deforestation, dumping of toxic waste in the ocean, burning of toxic materials, etc. - these activities violates the natural laws.
Just a knowledge of natural laws of the earth will suffice to avert climate change. But unfortunately, 95% of the people of planet Earth are not aware of these natural laws. Do we still need the endless complicated environmental laws made by man? Follow the natural laws aright man and you'll be okay!
It's a wake-up call particularly to the first world and highly industrialized countries particularly US which remains in denial and has not approved of the Kyoto Protocol which staunchly relate climate disturbances many countries like Australia and Saudi Arabia experience to Global Warming.
Being, the primary polluter together with China, India and the rest of the first world, progressive and industrialized countries led by the US should initiate measures to slowdown the effect of Global Warming or it will be the greatest threat not only to their security but of the world over. (The Learning Captain)
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