claim: "...there is the contention by Wolfgang Knorr of the Department of Earth Sciences at the University of Bristol in England that carbon dioxide levels in the atmosphere are about where they were 160 years ago." (as quoted by Ken Ward Jr.)
evidences.evidence_id: Botany:129
evidences.article: Botany
evidences.evidence: The concentration of carbon dioxide in the atmosphere today is much lower than it was when plants emerged onto land during the Ordovician and Silurian periods.
evidences.votes: REFUTES REFUTES
evidences.evidence_id: Eocene:20
evidences.article: Eocene
evidences.evidence: For example, diverse geochemical and paleontological proxies indicate that at the maximum of global warmth the atmospheric carbon dioxide values were at 700–900 ppm while other proxies such as pedogenic (soil building) carbonate and marine boron isotopes indicate large changes of carbon dioxide of over 2,000 ppm over periods of time of less than 1 million years.
evidences.votes: REFUTES REFUTES
evidences.evidence_id: Eocene:210
evidences.article: Eocene
evidences.evidence: "Paleobotanical Evidence for Near Present-Day Levels of Atmospheric CO2 During Part of the Tertiary".
evidences.votes: REFUTES REFUTES
evidences.evidence_id: Eocene:22
evidences.article: Eocene
evidences.evidence: For contrast, today the carbon dioxide levels are at 400 ppm or 0.04%.
evidences.votes: NOT_ENOUGH_INFO REFUTES
evidences.evidence_id: Ice age:153
evidences.article: Ice age
evidences.evidence: At a meeting of the American Geophysical Union (December 17, 2008), scientists detailed evidence in support of the controversial idea that the introduction of large-scale rice agriculture in Asia, coupled with extensive deforestation in Europe began to alter world climate by pumping significant amounts of greenhouse gases into the atmosphere over the last 1,000 years.
evidences.votes: REFUTES REFUTES