Thorny bushes are found in 

 hot and humid climate

Explanation:

Thorny bushes are primarily found in regions characterized by a hot and humid climate. These bushes thrive in areas with low rainfall, especially in subtropical regions where the annual precipitation can be as low as 500 millimeters. The lack of sufficient rainfall makes these areas more prone to desert-like conditions, creating a perfect environment for thorny bushes. These plants have adapted to conserve water and protect themselves from herbivores with their sharp thorns.

Such thorny bushes are commonly found in regions such as the hot desert climates where water is scarce, making them well-suited to survive in challenging environments. The thorny structures help reduce water loss and deter animals from feeding on the plants.