No. Not ALL scientists are of the opinion that anthropogenic existence is responsible for global warming, far from true. It's not chiefly important whether this message is reiterated by president Obama, Angela Merkel or whoever .. they personally have no clue .. their advice is biased to say the least, these days politicians will relinquish going against the popular idea that humans are defaulting their responsibility .. it'll cost many votes. The fallacious meme is reiterated endlessly and so few people are questioning what is posed, before you know it ideas that non-believers are thinking are deemed crazy.
Creepy it is, the majority of the populace parroting without trying to subtract, add and trying to understand for themselves if they can 'vouch' for this idea that will cost so much tax money and creates many job opportunities for those who do seem to make no big effort to scrutinize their own believes and motivation. I realize that the main stream media is placating what needs to be investigated and producing hyperbolic stories of no importance.
Question: Who are the 97% of scientists who believe climate change is caused by people? (September 11)
Question from Mark D., Raleigh, North Carolina
Answer by Brandon Miller, meteorologist, CNN International
Answer: We hear the term "scientific consensus" bantered about a lot when discussing climate change, and the 97% number -- which refers to the percentage of active climate scientists who believe people are causing climate change by burning fossil fuels -- is widely cited. There's a NASA page dissecting and touting the figure. Even President Barack Obama tweeted it. But where does this number actually come from? And who are these "97%" scientists?
First, here's where the number comes from: There are a few studies and surveys that have found an overwhelming majority of scientists who study climate change agree that the climate is warming and that humans are responsible for it. One of the largest and most widely referenced studies was published in 2009 by Peter Doran and Maggie Kendall Zimmerman. These researchers polled more than 3,000 Earth scientists, asking them simply 1) if they believed that the planet was warming, and 2) if human activity was a significant contributor in changing the global temperature.
The scientists came from a variety of fields within Earth science (geology, oceanography, paleontology and meteorology, to name a few). Ninety percent had Ph.D.s and 7% had master's degrees.
Nine in 10 of the scientists said global temperatures are rising and 82% said this rise is because of human activities such as burning fossil fuels and putting more heat-trapping gases in the atmosphere. But they didn't stop there.
To gauge the view of the scientists with the most expertise, the authors also looked specifically at responses from climate science experts -- meaning those who published 50% of their research in that field. For that group, the consensus was even more striking. More than 97% agreed that humans are causing the Earth's temperature to rise.
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Researchers keep getting similar results. An exhaustive review of published research on climate change was performed in a 2013 study by John Cook. The study looked at nearly 12,000 published studies over 20 years across a number of scientific, peer-reviewed journals containing the words "global warming" and "global climate change." Of those studies, approximately one-third stated a position on whether climate change was caused by humans, and, of those who stated a position on that subject, 97.1% of the research showed humans are causing the climate to change.
Mark D., the reader in North Carolina who asked about the 97%, also wanted to know, specifically, whether it's fair to say climate scientists have a bias ... simply because they're climate scientists.
It's an interesting point, but it's worth noting that science is dedicated to independent thinking. Scientists test, replicate and question their hypotheses. And, perhaps counterintuitively, there's actually an incentive for them to try to disprove deeply held scientific theories.
They haven't been able to do that for climate change.
"When people say scientists promote climate change to get grant money, it is an immediate sign they do not understand how grants are funded," Marshall Shepherd, director of the Atmospheric Sciences program at the University of Georgia, and publisher of research studies on climate change, wrote in an email. "It would actually be in the best interest of scientists to say to a funding source, 'We don't know if human-caused climate change is happening, so fund us to figure it out.' "
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Scientists are trying to question our understanding of this subject, and science is all about cataloging ongoing discovery. But our very best understanding of the science overwhelmingly indicates that the climate is changing and that humans likely are to blame.
That's shown both in the research and among the views of experts in climate science.
To wrap up, consider this: More than 200 scientific associations from all over the world, including the U.S. National Academy of Sciences, the World Meteorological Organization and the U.N. Intergovernmental Panel on Climate Change, all support this consensus.