Rats consume a sizeable percentage of rice production. From an earlier story [1]:<p><pre><code> The next call came from Australia in 2006. Biologists there
wanted an adaptation of Mouseopause for rats. Rats, they told
her, were eating 30% of the rice crop in Australia and
Indonesia. If she could reduce the rat population by even half,
they claimed, the crops that would be saved could feed millions
of people.
</code></pre>
[1] Man v rat: could the long war soon be over? (theguardian.com), <a href="https://news.ycombinator.com/item?id=12542718" rel="nofollow">https://news.ycombinator.com/item?id=12542718</a><p>Agricultural output is always variable. The world needs more storage capacity [2], and to better support small farmers. There's the ancient parable about "seven years of abundance" preceding "seven years of famine". Only "old" grain should be fed to animals.<p>For the most part, genetic engineering has been used to sell pesticides. While this C3->C4 innovation might not be as harmful as Monsanto's, it would be better to deal with our other agricultural problems too. Getting rats' numbers under control, and other low-tech investments (such as was undertaken in Thailand starting in the 1960's [3]), would be just as effective as throwing new seeds at farmers...<p>Haiti demonstrates that politics is the most important factor for determining agricultural output. [4]<p>[2] <a href="https://en.wikipedia.org/wiki/Grain_silo" rel="nofollow">https://en.wikipedia.org/wiki/Grain_silo</a>
[3] <a href="https://en.wikipedia.org/wiki/Rice_production_in_Thailand" rel="nofollow">https://en.wikipedia.org/wiki/Rice_production_in_Thailand</a>
[4] <a href="https://news.ycombinator.com/item?id=12531999" rel="nofollow">https://news.ycombinator.com/item?id=12531999</a> - "Why Are Haiti's Coffee Trees So Tall?"