This document discusses climate and climatic regions around the world. It begins by defining climate and its components, including temperature, moisture, and light. It also discusses microclimates. It then describes several major climatic regions: tropical and subtropical regions which are hot and wet year-round; dry climates including arid and semi-arid regions; Mediterranean climates with mild, wet winters and hot, dry summers; and temperate and mountain climates. The document also includes maps showing the distribution of climatic zones globally and within Turkey. It concludes by stating that horticulture incorporates both science and aesthetics through producing, improving, marketing, and using plants.