Synthesized answer
The author provides evidence in the form of his impressions and observations recorded during his travels [1]. He also recounts how he developed a superhigh-yielding variety of rice [1].
Furthermore, the author expresses his incredulity and despair at the international seed politics that hinder the use of this rice variety [1]. The passages do not provide further details on specific evidence beyond these points.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: The Road Back to Nature by Masanobu Fukuoka Description: In this collection of articles, lectures and essays, Fukuoka records for the first time his impressions and observations during his travels. He recounts also how he developed a superhigh-yielding variety of rice, and his incredulity and despair at the petty international seed politics that prevent the use of this miracle grain where it could do the most good. And he goes on to lucidly demonstrate the interdependence of nature, God and man. Categories: Nature Pages: 386 Snippet: In this collection of articles, lectures and…