Final answer:
Although high latitudes lose more radiant energy than they receive and low latitudes gain more, atmospheric circulation and ocean currents redistribute heat, maintaining Earth's temperature balance and preventing continuous temperature shifts at specific latitudes.
Step-by-step explanation:
The reason polar regions are not growing colder each year and tropical regions are not becoming warmer, despite the imbalance in radiant energy, is largely due to atmospheric circulation and ocean currents. These systems transfer heat from low to high latitudes, redistributing the excess energy absorbed at the equator towards the poles, thus maintaining the relatively constant temperature of the Earth. Factors such as the tilt of the Earth's axis affect the directness of sunlight, contributing to seasonal changes rather than a continuous increase or decrease in temperature at specific latitudes.