Crop yields are predicted to have frequent issues until 2050, when they will steadily decline. Bugs? Like Snowpiercer? That is gonna take a while and a lot of bad shit to happen to make people switch from meats to that.
But yeah they were talking about anything that is harvested I think, so mostly crops/agriculture and livestock as well I guess. Yields going down, soil losing fertility, earths ressources get no time to recover, temperatures rising, water reserves decreasing, sea levels rising, fishstocks declining rapidly, more droughts and on top of that, more mouths to feed. Yeah, thats not gonna end well.