Entropy is a physical concept descriptive of the evolution of matter and energy to its most probable state.  Put red and black marbles in a bag.  Most likely the red and black will be mixed.  This is entropy, progression of ordered states to disordered states simply because disordered states are more probable.  Energy can be expended to decrease local entropy (i.e. degree of disorder).  Thus as long as the sun shines or fossil fuel exists, we can reverse local entropy.