Before saying "False" and dropping the mic, you should pull the paper and look at Table 1. High temperature stresses start at 25°C. Above 35°C, photosynthesis

Before saying "False" and dropping the mic, you should pull the paper and look at Table 1. High temperature stresses start at 25°C. Above 35°C, photosynthesis drops by 15%, grain size suffers, etc. "Yields slowly decline" is a mischaracterization of the situation.