Contact: Catherine Beswick, email@example.com, National Oceanography Centre, Southampton (UK)
By comparing reconstructions of atmospheric CO2 concentrations and sea level over the past 40 million years, researchers based at the National Oceanography Centre, Southampton have found that greenhouse gas concentrations similar to the present (almost 400 parts per million) were systematically associated with sea levels at least nine metres above current levels.
The study determined the 'natural equilibrium' sea level for CO2 concentrations ranging between ice-age values of 180 parts per million and ice-free values of more than 1,000 parts per million.
It takes many centuries for such an equilibrium to be reached, therefore whilst the study does not predict any sea level value for the coming century, it does illustrate what sea level might be expected if climate were stabilized at a certain CO2 level for several centuries.
Lead author Dr Gavin Foster, from Ocean and Earth Science at the University of Southampton which is based at the centre, said, "A specific case of interest is one in which CO2 levels are kept at 400 to 450 parts per million, because that is the requirement for the often mentioned target of a maximum of two degrees global warming."
The researchers compiled more than two thousand pairs of CO2 and sea level data points, spanning critical periods within the last 40 million years. Some of these had climates warmer than present, some similar, and some colder. They also included periods during which global temperatures were increasing, as well as periods during which temperatures were decreasing.
(Reuters) - The Amazon rainforest is less vulnerable to die off because of global warming than widely believed because the greenhouse gas carbon dioxide also acts as an airborne fertilizer, a study showed on Wednesday.
The boost to growth from CO2, the main gas from burning fossil fuels blamed for causing climate change, was likely to exceed damaging effects of rising temperatures this century such as drought, it said.
"I am no longer so worried about a catastrophic die-back due to CO2-induced climate change," Professor Peter Cox of the University of Exeter in England told Reuters of the study he led in the journal Nature. "In that sense it's good news."
The world's tropical forests are less likely to lose biomass, or plant material, this century due to the effects of global warming than previously thought, scientists said in a paper published in the journal Nature Geoscience on Sunday.
This adds to growing evidence that rain forests might be more resilient to the effects of climate change than feared....
...In 2009, a group of British scientists said that 20 to 40 percent of the Amazon could die off within 100 years if global temperatures rose by 2 degrees Celsius, and 85 percent would be lost if temperatures rose by 4 degrees, which is seen as increasingly likely.
But a study last month said the Amazon rain forest was less vulnerable to dying off because carbon dioxide also acts as an airborne fertilizer.
The Global Warming Policy Foundation (GWPF) publishes almost daily newsletters containing information on climate science and energy policy, The Science & Environmental Policy Project (SEPP) publishes weekly newsletters on climate science and energy policy, and the Nongovernmental International Policy on Climate Change (NIPCC) by The Heartland Institute publishes weekly newsletters on latest peer-reviewed publications on climate science.
These are only three of hundreds, and maybe thousands worldwide, of Internet and published newsletters dealing with climate science and energy policies that show fallacies of the hypothesis carbon dioxide from burning fossil fuels causes catastrophic global warming and energy policies trying to reduce fossil fuel use. Free subscriptions are available from all sources by simply checking a box “subscribe” on their home pages. [Get the weekly NIPCC report here.]
The February 21, 2013 GWPF featured an article titled, “The phase relation between atmospheric carbon dioxide and global temperatures,” Global and Planetary Change, Vol 100, January 2013, pp 51-69. The Norwegian authors are Ole Humlum, Kjell Stordahl, and Jan-Erik Solheim.
This is an important piece of research that should have been reported years ago. However, due to research funding in the United States and other parts of the world only being distributed to support the hypothesis carbon dioxide from burning fossil fuels causes global warming, this type of research would be deemed irrelevant.
Alan Jones is Australia's most popular talk back presenter. Alan Jones is a phenomenon. He is described by many as Australia's greatest orator and motivational speaker. Alan has the mind and capacity to make complex issues understandable to the largest Breakfast audience in Australia.
Alan Jones comments on a statement released by ACMA to comments made by him on March 15 last year
The 2012 year-end satellite measurements continue to be cruel to the IPCC's green-sharia scientists - this UN agency has long predicted huge atmospheric global warming from CO2 emissions .....yet in reality, global cooling currently dominates
The Scottish government failed to meet its own climate change targets in 2010, according the latest official figures.
They showed greenhouse gas emissions rose by 1.9% on 2009 figures, after taking emissions trading into account. Climate Change Minister Stewart Stevenson said exceptionally cold weather conditions in Scotland in 2010 was to blame.
The government is attempting to reduce greenhouse gas emissions by 42% by 2020. Climate Change Minister Stewart Stevenson said exceptionally cold weather conditions in Scotland in 2010 was to blame. Mr Stevenson said "Scotland faced its coldest winter temperatures in almost a century - and quite rightly people across Scotland needed to heat their homes to keep warm and safe".
He added: "The Scottish government remains fully committed to delivering ambitious and world-leading climate change targets. We always knew it would be a challenging path to follow when these were set and that year to year fluctuations were inevitable".
Figure 1. Temperature and CO2 variations as per the cited data sources. Temperature variations have been divided by 2, as discussed in the text. Graph ends at 1950, most recent CO2 data is from about 2,300 years ago. Maximum temperature during the previous interglacial was about a degree and a half warmer than 1950. Photograph shows that Photo Source http://dxing.at-communication.com/en/ri1anc_vostok-base_antarctica/
There’s been a recent paper claiming a long-term correlation between CO2 and sea level, discussed here at WUWT. The paper implies that CO2 controls temperature and thus indirectly sea level. I thought I might follow up the comments on that thread by looking at what the ice core records actually tell us about variations in CO2. There is plenty of dispute about the ice core records, but I don’t want to touch on that here, that’s a separate discussion. Instead, let me take the ice core records as given and see where that leads us. Figure 1 shows the Vostok ice core CO2 and temperature variations.