3 ms·

We’d have to assume that due to the greenhouse effect , the earth was also hotter then ?

• Tade0 3y ago
  20mln years ago the sun was around 0,2% colder, which isn't a lot, but still more than variability from solar cycles.
  • chrisco255 3y ago
    Do you have a source on that? We have been in an ice age for roughly the past million years. Pretty sure it was warmer in almost every other era prior.
    • mlyle 3y ago
      > > 20mln years ago the sun was around 0,2% colder > Do you have a source on that? It's not solar radiation forcing that has made things relatively cooler, but it is cooler than 20M years ago. Of course, we could actually reach those temperatures again soon. https://environmental-geology-dev.pressbooks.tru.ca/chapter/changes-in-solar-output-and-in-the-earths-atmosphere/ https://environmental-geology-dev.pressbooks.tru.ca/chapter/... See fig 3.1.2. "The present rate of solar warming is about 8% every billion years. That’s 0.008% every million years or 0.0000008% every century."