Hacker Read top | best | new | newcomments | leaders | about | bookmarklet login

> the sun was about 20% dimmer back then

According to wikipedia[1], the Sun increases in brightness steadily about 1% every 100M years, yet we had CO2 levels 10 times higher than now about 500M years ago.

[1] https://en.wikipedia.org/wiki/Solar_luminosity



view as:

Legal | privacy