"How fast are the oceans warming?" was the main question addressed by a team of Chinese and U.S. scientists in a research which demonstrates that "global warming is here and has major consequences already. There is no doubt, none!"
New measurements, aided by an international network of 3,900 floats deployed in the oceans since 2000, showed more warming - since 1971 - than calculated by the 2013 UN assessment of climate change.
According to Lijing Cheng, a scientist from China's Institute of Atmospheric Physics, "2018 was the warmest year on record for the global ocean" as marine temperatures as far down as 2,000 meters rose about 0.1 degree Celsius.
"Observational records of ocean heat content show that ocean warming is accelerating," the team of scientists stated and also explained that greenhouse gas emissions warm the atmosphere, and a large part of the heat gets absorbed by the oceans.
The heat absorption process, in turn, changes the physical-chemical properties of marine ecosystems, which displaces marine like forcing them to flee to cooler waters.
Deep ocean temperatures are less influenced by annual variations in weather and can take more than 1,000 years to adjust to changes like regions closer to the surface. "The deep ocean reflects the climate of the deep and uncertain past," Kevin Trenberth, a co-author of the study, said.
Among effects, extra warmth can reduce oxygen in the ocean and damage coral reefs that serve as nurseries for fish, the scientists said. While warmer seas release more moisture that can stoke more powerful storms.
Despite growing evidence of the human-driven global climate change, some heads of state and government across the globe - mainly far-right administrations - deny the existence of a problem.