Past evidence of CO2 levels, brought out by a research team has been looked upon as supporting the IPCC claims of global warming and climate change. The latest finding by the University of Southampton reveal that the CO2 levels of the Earth’s atmosphere were about 350 to 400 ppm according to past records. The team analysis was based on the time period between 2.3 to 3.3 million years ago some time during the Pliocene period. During the period, the team reports that the Earth’s temperature was about two degrees Celsius higher than the present day mean temperatures seen today.
Research team says past records are important for understanding Earth’s response to change
Commenting on the project, Dr Gavin Foster, one of the authors of the research said, “Today the Earth is still adjusting to the recent rapid rise of CO2 caused by human activities, whereas the longer-term Pliocene records document the full response of CO2-related warming,” and that is why the research team believes that by analyzing the connection between climate change and CO2 levels during one of the most warmest period known to mankind, they will be able to calculate approximately how Earth’s climate is going to respond to rising carbon dioxide levels. The team named this parameter ‘climate sensitivity’.
Conclusion substantiates IPCC claims and findings
Elaborating more on the topic of climate sensitivity, Dr. Foster remarked that the team’s estimations of climate sensitivity fell within the range of 1.5-4.5 degree Celsius mentioned by the latest IPCC report. The findings, according to him, pointed to the fact that the scientific community had a sound understanding of the response Earth will have towards climate change. As part of their study, the research group also looked at the difference in climate sensitivity during the different warm periods and compared them with historic colder times; for instance, the glacial phases that took place around 800,000 years ago.