People adapt to their environment.
In arid areas with little plant life, people often become nomads, following their herds of livestock wherever they can find food. In very cold regions, people depend upon wild animals for food and clothing. In hot regions, people are accustomed to wearing lightweight clothing. People who live near lakes and oceans often depend upon fish for their diet. Many Asians depend upon rice as one of their main food because rice grows well in hot, wet climates. People in large cities learn to avoid speaking to or looking at strangers, while people in rural areas often welcome strangers.
It's also interesting to note that in the Islamic religion, which started in arid lands, heaven is pictured with lots of rain, lush plant life, rivers, and lakes.