3 ms·
As I understand it, the oldest record we have of past CO2 levels is glacial ice cores that go back about 600k years. In those, at least, CO2 has never been high
by encoderer 17y ago
As I understand it, the oldest record we have of past CO2 levels is glacial ice cores that go back about 600k years. In those, at least, CO2 has never been higher than today.
- jibiki 17y agoIt is hypothesized that Earth's atmosphere initially contained much higher % C02. "Based on today's volcanic evidence, this atmosphere would have contained 80% water vapor, 10% carbon dioxide, 5 to 7% hydrogen-sulfur, and smaller amounts of nitrogen, carbon monoxide, hydrogen, methane and inert gases." http://en.wikipedia.org/wiki/Earth%27s_atmosphere#Earliest_atmosphere http://en.wikipedia.org/wiki/Earth%27s_atmosphere#Earliest_a...