The difference between non-spontaneous and spontaneous reactions is that non-spontaneous reactions:

occur faster than spontaneous reactions

require outside interference to occur

release free energy

occur without an input of heat

The answer to your question is: second option

Explanation:

occur faster than spontaneous reactions   The speed of a reaction does not depend if it s spontaneous or not. This option is incorrect.

require outside interference to occur  This option is true, non spontaneous reactions requiere heat, a catalizer or any interference to occur.

release free energy   This option is not true, they could or not release energy

occur without an input of heat This option is false, most of non-spontaneous reactions requiere heat to occur.

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.