Source?
It's like asking for a source to prove the sky is blue or that the earth is round...
This community claims to be one of educated professionals, yet somehow there's comments questioning things that are literally common knowledge and if somehow they don't know, can't spend 2 seconds to google it? Instead write "Source?". It's intellectually lazy as hell.
Yes. But then we invented science and "common knowledge" was proven ignorant time and time again.
>It's like asking for a source to prove the sky is blue or that the earth is round...
Hardly. I can't look out my window and see what the temperature was thousands of years ago.
>This community claims to be one of educated professionals
You're claiming that, not 'the community.'
What is intellectually lazy is not providing information that verifies your claims, and instead preferring to debate the social circumstances of an internet discussion. You're not obligated to provide a source. You don't have to do it. But don't think you're somehow more intellectually honest or hardworking because you refuse to.
If 2 seconds of googling solves this problem, then you should have probably just done that rather than arguing about whether you should need to.
As an aside, the reason we know that CO2 affects earth's temperature is the same reason we know what kind of vegetation existed during that same time period. Because of observations in the fossil record.
Sure the earth was warmer in the past, it was also colder, it was also a molten hellscape. Trying to relate a grade schooler's understanding of geologic time to specific climate models seems to be far more intellectually lazy than asking for a source so people can put your very vague claims into context.
[0]https://curiosity.com/topics/pluto-and-neptune-swap-places-e... [1]https://en.wikipedia.org/wiki/Epigenetics [2]https://en.wikipedia.org/wiki/Sex_and_gender_distinction
Climate science is based on past CO2 levels and uses the fossil record of foliage to estimate temperatures. Not even the most dire predictions claim the earth will be mostly desert in 100 years. There will be flooding and some desertification, but many regions will also become greener.
Even NASA has observed that the earth is greener today than 40 years ago.