claim: “[Carbon dioxide] just crossed 400 parts per million, and high-end estimates extrapolating from current trends suggest it will hit 1,000 ppm by 2100.
evidences.evidence_id: Carbon dioxide:579
evidences.article: Carbon dioxide
evidences.evidence: For an ideal gas mixture this is equivalent to parts per million by volume (ppmv).
evidences.votes: NOT_ENOUGH_INFO SUPPORTS
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: SUPPORTS SUPPORTS
evidences.evidence_id: Greenhouse effect:52
evidences.article: Greenhouse effect
evidences.evidence: Measurements of CO 2 from the Mauna Loa observatory show that concentrations have increased from about 313 parts per million (ppm) in 1960, passing the 400 ppm milestone on May 9, 2013.
evidences.votes: SUPPORTS SUPPORTS
evidences.evidence_id: Greenhouse gas:111
evidences.article: Greenhouse gas
evidences.evidence: Carbon dioxide mole fractions in the atmosphere have gone up by approximately 35 percent since the 1900s, rising from 280 parts per million by volume to 387 parts per million in 2009.
evidences.votes: SUPPORTS REFUTES
evidences.evidence_id: Greenhouse gas:547
evidences.article: Greenhouse gas
evidences.evidence: The oft-cited Mauna Loa average for 2012 is 393.8 ppm, which is a good approximation although typically about 1 ppm higher than the spatial average given above.
evidences.votes: SUPPORTS SUPPORTS