The United States was a hot spot in the 1970s and 1980s, but now it’s experiencing a cooling trend that is being attributed to human activity, according to a new study.
The new research shows that the Earth’s temperature has been declining steadily in the last several decades and is expected to continue cooling in the coming decades.
In a new paper published in the journal Science Advances, researchers from Columbia University, the University of California-Berkeley, the Australian National University and other institutions compared temperature trends across the globe over the past 100 years to understand the effect human activity has on the planet’s climate.
The authors say their findings will inform policies for protecting the environment and addressing global warming.
The paper is the first to use a global dataset to compare temperatures between the past and present, which is used by the United Nations Framework Convention on Climate Change (UNFCCC).
The UNFCCC is the world’s primary international body for implementing climate change policies.
The scientists analyzed data from a variety of sources, including satellite temperature records, ice core samples and ocean currents.
They found that the global average temperature has decreased between 1910 and 2010 by 0.5°C per decade, or 0.06 degrees Celsius.
But since the beginning of the 21st century, the average temperature across the planet has been rising by 0 and 1.6°C, respectively.
“In general, the warming is concentrated in a relatively short period of time,” the authors write.
“For example, between 1910 to 2010, the annual average global warming over the 21 st century has increased by 0,1.6 degrees Celsius and 0,6.6 degree Celsius respectively.”
The researchers estimate that global warming has been occurring at a rate of 0.7°C a year for the last 20 years.
But as the Earth warms, it will become more intense, and the rate of warming will slow.
While the rate at which the world has warmed has been decreasing, the rate has not been uniform over the world, according the paper.
For example, the researchers found that in the past decade, the world experienced temperatures that were 2.4 degrees Celsius higher than in the pre-industrial era.
“The warming over time has been so uniform that it makes it hard to pinpoint which climate event is causing the warming,” study co-author James Hansen, an atmospheric scientist at Columbia University who is a member of the Intergovernmental Panel on Climate Modeling (IPCC), told The Hill.
The warming that the researchers observed in the 1980s and 1990s is similar to what we see today, Hansen said.
But there are also some important differences.
For example:While the 1980’s were marked by a slight cooling trend, the 1990s were marked with a steep increase in temperatures.
This is due to a cooling effect that occurs in the oceans, which heat up the atmosphere as they rise.
“When the oceans warm, the air above them is also warming.
This means the planet is warming,” Hansen said, adding that the ocean temperature also influences the rate and intensity of the jet stream that moves air around the world.”
We are seeing a slight slowdown of the Pacific Decadal Oscillation (PDO) which is the climate system’s natural oscillator.
But this is not the same as an outright cooling trend.”
The IPCC has published a number of climate models to predict how the world will respond to climate change.
The study shows that some models have been able to predict temperatures that have been hotter than previous decades.
But other models, such as the ones based on data from the Global Burden of Carbon, show no trend.
“There’s nothing to suggest the PDO will be able to keep pace with the warming that is happening on the Earth,” Hansen explained.
In an email to The Hill, a representative from the United States National Oceanic and Atmospheric Administration (NOAA) said the agency did not comment on specific studies.
“These datasets are available for the National Centers for Environmental Prediction and NOAA climate change programs,” the spokesperson said.
The NOAA’s website states that “NOAA climate models are able to simulate a wide range of natural climate phenomena such as land surface temperatures, ocean currents, and solar activity.”
The authors write that the warming trend is consistent with the observed warming over geological time.
“It’s hard to say whether it is due, in part, to anthropogenic emissions,” they wrote.
“Or, more likely, it’s due to changes in oceanic circulation that are causing a cooling that has been present over geological times.”
This article tagged under: climate,satellites,study,hansen,global warming source The Washington Post title ‘Earth’s temperature is decreasing’ article Scientists say the planet could become hotter and warmer over the next century as a result of human activity.