for you desert growers, is that with high heat AND low humidity, your plant will be respiring faster than it can uptake water. It will close its stomata to reduce water loss..and bam. No more co2 is absorbed for production. What the plant then does is a very wasteful process of using rubisco to creat sugars by combining o2 with Rubp instead of co2. This is half as effecting and also creates a toxic C molecule that has to be broken down. I can't remember the specifics but it makes some sort of glypholate? Acid that then has to be evbtually broken down into glycine I think it is