claim: When stomata-derived CO2 (red) is compared to ice core-derived CO2 (blue), the stomata generally show much more variability in the atmospheric CO2 level and often show levels much higher than the ice cores.
evidences.evidence_id: Carbon dioxide in Earth's atmosphere:56
evidences.article: Carbon dioxide in Earth's atmosphere
evidences.evidence: Relevant to this dispute is the observation that Greenland ice cores often report higher and more variable CO 2 values than similar measurements in Antarctica.
evidences.votes: NOT_ENOUGH_INFO NOT_ENOUGH_INFO
evidences.evidence_id: Greenhouse gas:112
evidences.article: Greenhouse gas
evidences.evidence: One study using evidence from stomata of fossilized leaves suggests greater variability, with carbon dioxide mole fractions above 300 ppm during the period seven to ten thousand years ago, though others have argued that these findings more likely reflect calibration or contamination problems rather than actual CO 2 variability.
evidences.votes: SUPPORTS SUPPORTS
evidences.evidence_id: Greenhouse gas:113
evidences.article: Greenhouse gas
evidences.evidence: Because of the way air is trapped in ice (pores in the ice close off slowly to form bubbles deep within the firn) and the time period represented in each ice sample analyzed, these figures represent averages of atmospheric concentrations of up to a few centuries rather than annual or decadal levels.
evidences.votes: SUPPORTS NOT_ENOUGH_INFO
evidences.evidence_id: Greenhouse gas:127
evidences.article: Greenhouse gas
evidences.evidence: Measured atmospheric concentrations of carbon dioxide are currently 100 ppm higher than pre-industrial levels.
evidences.votes: NOT_ENOUGH_INFO NOT_ENOUGH_INFO
evidences.evidence_id: Ice core:4
evidences.article: Ice core
evidences.evidence: The proportions of different oxygen and hydrogen isotopes provide information about ancient temperatures, and the air trapped in tiny bubbles can be analysed to determine the level of atmospheric gases such as carbon dioxide.
evidences.votes: NOT_ENOUGH_INFO NOT_ENOUGH_INFO