Crop yields have more than doubled since 1961.  The press reports this as a 21% decline.

“between 1961 and 2021, climate change reduced global agricultural yield by 21%.”

How agriculture is exacerbating global warming | S&P Global Commodity Insights

Crop Yields – Our World in Data

During the 1960s millions of people were dying in Asia from famine, and US academics said the world would run out of food by 1975.

17 Nov 1967, Page 9 – The Salt Lake Tribune at Newspapers.com

Aug 03, 1962, page 4 – The Winchester Sun at Newspapers.com

Feb 19, 1966, page 7 – The News-Messenger at Newspapers.com

“Carbon Dioxide Fertilization Greening Earth, Study Finds”

Carbon Dioxide Fertilization Greening Earth, Study Finds – NASA