As the temperature on Earth increases the polar ice caps are melting. This melting of the polar caps results in a lower albedo, or refection of solar radiation. This lower albedo means that more solar radiation reaches the Earth and the Earth warms in response. This is an example of a

Seasonal temperature variations and long-term climate change cause melting of the polar ice caps. As of 2014, temperatures in the Arctic are increasing at double the rate of elsewhere in the world. As a result, ice in the Arctic is thinning and melting. Arctic ice is decreasing by 9 percent each decade, according to data derived from NASA satellite images.

Explanation:

b.