News for hackers. Stuff that matters.

A comment on We Just Breached the 410 PPM Threshold for CO2. Parent comment

Re:We Just Breached the 410 PPM Threshold for CO2 by tim333 on Sunday April 23, 2017 @05:09AM (#14177278)
>all of the carbon in fossil fuels used to be in the atmosphere... The earth was just fine.

A problem with that argument is that the sun was about 20% dimmer back then. Hence it may get hotter this time around.

[ Parent | on HN ]
Re:We Just Breached the 410 PPM Threshold for CO2 by akvadrako on Wednesday April 26, 2017 @10:04AM (#14203013)
> 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

[ Parent | on HN ]