consequently, co2 levels at around 1,000 to 2,300 ppm were actually low enough to promote glaciation in the southern continent of gondwana.
consequently, co2 levels at around 1,000 to 2,300 ppm were actually low enough to promote glaciation in the southern continent of gondwana.
carbon dioxide:250
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.