The short answer is, they would die. The trees are the way they are because they've adapted to their environment. At a high level, trees in hot sunny areas will

The short answer is, they would die. The trees are the way they are because they've adapted to their environment. At a high level, trees in hot sunny areas will have smaller leaves because they can get enough sunlight from a smaller surface area, and smaller leaves lose less water. But it is more complicated than that, of course. It's not just "how hot does it get", but also how much water is available, how windy it is, how cold it gets, and a million other environmental factors. That's why there is such a wide variety among the plants on earth. (and yes, it has been tried. Check out the youtube channel "crime pays but botany doesn't")