‘No Doubt Left’: Scientific Consensus on Global Warming Passes 99%

Data shows recent and extreme warming is unprecedented in the past 2,000 years.

The scientific community is in all but complete agreement that humans are the most detrimental contributor to global warming, according to a recent report from The Guardian citing the lead author of the most authoritative climate study.

According to the Guardian’s Jonathan Watts, “three studies published in Nature and Nature Geoscience use extensive historical data to show there has never been a period in the last 2,000 years when temperatures have been as fast and extensive as in recent decades.”

The rapid change in extreme temperatures and weather patterns is generally believed to be the result of a post-industrial revolution world emitting large amounts of carbon dioxide into the atmosphere, and modern agricultural practices increasing methane levels in the atmosphere; both contributors to the greenhouse effect.

“It had previously been thought that similarly dramatic peaks and troughs might have occurred in the past, including in periods dubbed the Little ice Age and the Medieval Climate Anomaly,” Watts writes.

“But the three studies use reconstructions based on 700 proxy records of temperature changes, such as trees, ice and sediment, from all continents that indicate none of these shifts took place in more than half the globe at any one time.”

According to the third study, major changes in the earth’s temperature have become particularly radical since the late 20th century, when, according to The Guardian, “temperature rises over two decades or longer have been the most rapid in the past two millennia.”

Mark Maslin, professor of climatology at the University College London aired his hopes that

“this paper should finally stop climate change deniers claiming that the recent observed coherent global warming is part of a natural climate cycle,”

“This paper shows the truly stark difference between regional and localised changes in climate of the past and the truly global effect of anthropogenic greenhouse emissions,” Maslin said.

A paper published in 2013 named Environmental Research Letters determined that 97% of climate scientists agreed with the link from 12,000 academic papers containing the words ‘global warming’ or ‘global climate change’ between 1991 to 2011. The paper in question has since reached 1-million downloads, making it, according to the authors, the most accessed paper in the history of online research papers.

“There is no doubt left- as has been shown extensively in many other studies addressing many different aspects of the climate system using different methods and data sets,” Stefan Brönnimann from the University of Bern and the Pages 2K consortium of climate scientists said.

John Cook, who was the lead author in the original consensus paper, as well as a follow-up on the topic writes that after twenty-years, there is more agreement than ever before. “As expertise in climate science increases, so too does agreement with human-caused global warming,” he wrote on his blog.

“The good news is public understanding of the scientific consensus is increasing. The bad news is there is still a lot to do yet as climate deniers continue to persistently attack the scientific consensus.”

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