I skimmed the piece. Despite the repeated claims, no evidence is given for agricultural failure on any timeline.

The very first sentence says:

> Climate change will cause agricultural failure and subsequent collapse of hyperfragile modern civilization, likely within 10–15 years.

No evidence is provided for this. The closest thing is some very brief discussion of saltwater increasingly interfering with rice cultivation in some areas of Southeast Asia. Everything else is ungrounded speculation.

And regarding those poor rice farmers, apparently a lot of them are switching to more lucrative shrimp farming when salinity is high: https://www.voanews.com/a/rising-salinity-threatens-rice-cro...

This is not to say that climate change is great. Just that this is not a reliable source.