Arabica grows best in a cooler climate, with an average annual temperature of 19C, making it difficult to grow as the planet warms.
How much of the planet currently has a less than 19C average annual temperature? After a 2 – or 3, what the hell – C warming how much of the planet will have a 19C average annual temperature?
My best guess of that second is about the same amount as now. That is, there will still be that same amount of land in the right climate belt to grow the coffee.
It’ll be different land though. Which is what sparks this hunt for a replacement. That those currently growing coffee on this piece of land can switch as temperature does. As a global problem it doesn’t exist.