"February is one of the first months since before months had names to boast carbon dioxide concentrations at 400 parts per million.* Such CO2 concentrations in the atmosphere have likely not been seen since at least the end of the Oligocene 23 million years ago, an 11-million-year-long epoch of gradual climate cooling that most likely saw CO2 concentrations drop from more than 1,000 ppm. Those of us alive today breathe air never tasted by any of our ancestors in the entire Homo genus."
...
"We aren't done yet. Greater concentrations will be achieved, thanks to all the existing coal-fired power plants, more than a billion cars powered by internal combustion on the roads today and yet more clearing of forests. That's despite an avowed goal to stop at 450 ppm, the number broadly (if infirmly) linked to an average temperature rise of no more than 2 degrees C. More likely, by century's end enough CO2 will have been spewed from burning long-buried stores of fossilized sunshine to raise concentrations to 550 ppm or more, enough to raise average annual temperatures by as much as 6 degrees C in the same span. That may be more climate change than human civilization can handle, along with many of the other animals and plants living on Earth, already stressed by other human encroachments. The planet will be fine though; scientists have surmised from long-term records in rock that Earth has seen levels beyond 1,000 ppm in the past."
http://www.scientificamerican.com/artic ... ric-highs/
"Most people thought that the risks were going to be for certain species and poor people. But all of a sudden the European heat wave of 2003 comes along and kills 50,000, [Hurricane] Katrina comes along and there's a lot of data about the increased intensity of droughts and floods. Plus, the dramatic melting of Greenland that nobody can explain certainly has to increase your concern," says climatologist Stephen Schneider of Stanford University, who co-authored the research published this week in the Proceedings of the National Academy of Sciences as well as in several IPCC reports. "Everywhere we looked, there was evidence that what was believed to be likely has happened. Nature has been cooperating with [climate change] theory unfortunately."
http://www.scientificamerican.com/artic ... ng-rising/
Yesterday:
"A microscopic marine alga is thriving in the North Atlantic to an extent that defies scientific predictions, suggesting swift environmental change as a result of increased carbon dioxide in the ocean, a study led a by Johns Hopkins University scientist has found."
...
""Something strange is happening here, and it's happening much more quickly than we thought it should," said Anand Gnanadesikan, associate professor in the Morton K. Blaustein Department of Earth and Planetary Sciences at Johns Hopkins and one of the study's five authors.
Gnanadesikan said the Science report certainly is good news for creatures that eat coccolithophores, but it's not clear what those are. "What is worrisome," he said, "is that our result points out how little we know about how complex ecosystems function." The result highlights the possibility of rapid ecosystem change, suggesting that prevalent models of how these systems respond to climate change may be too conservative, he said.""
http://phys.org/news/2015-11-rapid-plan ... .html#nRlv
2013:
"The last time there was this much carbon dioxide (CO2) in the Earth's atmosphere, modern humans didn't exist. Megatoothed sharks prowled the oceans, the world's seas were up to 100 feet higher than they are today, and the global average surface temperature was up to 11°F warmer than it is now."
...
" For a 2009 study, published in the journal Science, scientists analyzed shells in deep sea sediments to estimate past CO2 levels, and found that CO2 levels have not been as high as they are now for at least the past 10 to 15 million years, during the Miocene epoch.
“This was a time when global temperatures were substantially warmer than today, and there was very little ice around anywhere on the planet. And so sea level was considerably higher — around 100 feet higher — than it is today,” said Pennsylvania State University climate scientist Michael Mann, in an email conversation. “It is for this reason that some climate scientists, like James Hansen, have argued that even current-day CO2 levels are too high. There is the possibility that we’ve already breached the threshold of truly dangerous human influence on our climate and planet.""
http://www.climatecentral.org/news/the- ... xist-15938
...
"We aren't done yet. Greater concentrations will be achieved, thanks to all the existing coal-fired power plants, more than a billion cars powered by internal combustion on the roads today and yet more clearing of forests. That's despite an avowed goal to stop at 450 ppm, the number broadly (if infirmly) linked to an average temperature rise of no more than 2 degrees C. More likely, by century's end enough CO2 will have been spewed from burning long-buried stores of fossilized sunshine to raise concentrations to 550 ppm or more, enough to raise average annual temperatures by as much as 6 degrees C in the same span. That may be more climate change than human civilization can handle, along with many of the other animals and plants living on Earth, already stressed by other human encroachments. The planet will be fine though; scientists have surmised from long-term records in rock that Earth has seen levels beyond 1,000 ppm in the past."
http://www.scientificamerican.com/artic ... ric-highs/
"Most people thought that the risks were going to be for certain species and poor people. But all of a sudden the European heat wave of 2003 comes along and kills 50,000, [Hurricane] Katrina comes along and there's a lot of data about the increased intensity of droughts and floods. Plus, the dramatic melting of Greenland that nobody can explain certainly has to increase your concern," says climatologist Stephen Schneider of Stanford University, who co-authored the research published this week in the Proceedings of the National Academy of Sciences as well as in several IPCC reports. "Everywhere we looked, there was evidence that what was believed to be likely has happened. Nature has been cooperating with [climate change] theory unfortunately."
http://www.scientificamerican.com/artic ... ng-rising/
Yesterday:
"A microscopic marine alga is thriving in the North Atlantic to an extent that defies scientific predictions, suggesting swift environmental change as a result of increased carbon dioxide in the ocean, a study led a by Johns Hopkins University scientist has found."
...
""Something strange is happening here, and it's happening much more quickly than we thought it should," said Anand Gnanadesikan, associate professor in the Morton K. Blaustein Department of Earth and Planetary Sciences at Johns Hopkins and one of the study's five authors.
Gnanadesikan said the Science report certainly is good news for creatures that eat coccolithophores, but it's not clear what those are. "What is worrisome," he said, "is that our result points out how little we know about how complex ecosystems function." The result highlights the possibility of rapid ecosystem change, suggesting that prevalent models of how these systems respond to climate change may be too conservative, he said.""
http://phys.org/news/2015-11-rapid-plan ... .html#nRlv
2013:
"The last time there was this much carbon dioxide (CO2) in the Earth's atmosphere, modern humans didn't exist. Megatoothed sharks prowled the oceans, the world's seas were up to 100 feet higher than they are today, and the global average surface temperature was up to 11°F warmer than it is now."
...
" For a 2009 study, published in the journal Science, scientists analyzed shells in deep sea sediments to estimate past CO2 levels, and found that CO2 levels have not been as high as they are now for at least the past 10 to 15 million years, during the Miocene epoch.
“This was a time when global temperatures were substantially warmer than today, and there was very little ice around anywhere on the planet. And so sea level was considerably higher — around 100 feet higher — than it is today,” said Pennsylvania State University climate scientist Michael Mann, in an email conversation. “It is for this reason that some climate scientists, like James Hansen, have argued that even current-day CO2 levels are too high. There is the possibility that we’ve already breached the threshold of truly dangerous human influence on our climate and planet.""
http://www.climatecentral.org/news/the- ... xist-15938
