This is supposed to mock those who stress the fact that there is no evidence of AGW driven by CO2 emissions and disastrous short-term consequences.
Once again, poor rhetoric and no evidence.
Since it seems people only understand rhetoric:
> Thunberg **did delete** a tweet from her account from **2018** that read, "A top climate scientist is warning that climate change will wipe out all of humanity unless we stop using fossil fuels over the **next five years.**"
https://www.snopes.com/fact-check/greta-thunberg-deleted-2018-tweet-on-humanity/