claim: Consequently, CO2 levels at around 1,000 to 2,300 ppm were actually low enough to promote glaciation in the southern continent of Gondwana.
evidences.evidence_id: Carbon dioxide in Earth's atmosphere:5
evidences.article: Carbon dioxide in Earth's atmosphere
evidences.evidence: Concentrations of CO 2 in the atmosphere were as high as 4,000 parts per million (ppm, on a molar basis) during the Cambrian period about 500 million years ago to as low as 180 ppm during the Quaternary glaciation of the last two million years.
evidences.votes: REFUTES NOT_ENOUGH_INFO
evidences.evidence_id: Carbon dioxide in Earth's atmosphere:51
evidences.article: Carbon dioxide in Earth's atmosphere
evidences.evidence: Decreasing CO 2 concentration, with a tipping point of 600 ppm, was the primary agent forcing Antarctic glaciation.
evidences.votes: REFUTES SUPPORTS
evidences.evidence_id: Carbon dioxide:250
evidences.article: Carbon dioxide
evidences.evidence: Carbon dioxide content in fresh air (averaged between sea-level and 10 kPa level, i.e., about 30 km (19 mi) altitude) varies between 0.036% (360 ppm) and 0.041% (410 ppm), depending on the location.
evidences.votes: REFUTES NOT_ENOUGH_INFO
evidences.evidence_id: Gondwana:187
evidences.article: Gondwana
evidences.evidence: However, strong evidence exists of glaciation during the Carboniferous to Permian time, especially in South Africa.
evidences.votes: SUPPORTS SUPPORTS
evidences.evidence_id: Supercontinent:88
evidences.article: Supercontinent
evidences.evidence: During the late Ordovician (~458.4 Ma), the particular configuration of Gondwana may have allowed for glaciation and high CO2 levels to occur at the same time.
evidences.votes: SUPPORTS SUPPORTS