Earth can be divided into three zones based on differences and incoming solar radiation identify these zones describe their location and general climate also discuss how the sun's energy strikes each zone.

From that description we have the three climate zones of the earth,

The Polar which receives little-to-none sunlight energy which caused these areas to be extremely cold.

The Temperate areas are those with moderate temperatures where they experience both the ample hotness and coldness in temperature

The Tropical areas are those that are extremely radiated and shunned by the sunlight energy, with temperatures over 30 C and above.

It's either -limiting factors or -scarce resources but i'd go with my first answer since the food and water are abundant they really aren't scarce