Q.Why Is My Pear Tree Leaves Growing Like This?
The first thing to note is that my pear trees are being grown outside of their normal growing region. I actually managed to grow them from seed in The Bahamas. In the Bahamas we have Tropical weather. The temperature Is usually in the lower to mid 90s and so i try to water when i see the soil is dry. Originally it had nice green foliage and then the leaves started growing smaller and their color changed from a nice dark green to a greenish-brownish color. I have two other Pear trees and their leaves Are not growing like how this one is growing. Please Help me.

Certified GKH Gardening Expert
Unfortunately, this may be a case of too much water! This looks to be the start of an infection, and suffocated roots.
Make sure to let the soil dry, thoroughly, down to about 3 or 4 inches between waterings.
It will, likely, never flower, since it will never have enough chilling hours to do so, unfortunately. But, it can make for a nice foliage tree with some care.
Here are some articles that will help:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm
https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm
https://www.gardeningknowhow.com/edible/fruits/pear/growing-pear-trees.htm