Today, the second law is also defined in terms of entropy, i.e. for a closed system, entropy can never decrease. In a reversible process, the entropy changes only if there is heat transfer during the process. If heat is added, then entropy increases, and if there is no heat transfer, then entropy remains constant.
This law for a closed system also refers to the same thing. Entropy is opposite to energy. We already know that the energy of a closed system can never increase without the help of an external element; at the same place entropy can never decrease. If we convert energy form one type to another, then there will be a loss of energy all the time, at the same place there will be always a gain in entropy. You can easily understand this concept if you compare both terms- energy and entropy of a closed system- simultaneously.
I mentioned that entropy is totally dependent on heat transfer. Entropy remains constant only when there is no heat transfer in a closed system. So, we can say that if entropy can be seen to be pretty-much constant, then all life violates the second law of thermodynamics. Because if entropy is constant, then there will be no heat transfer. The whole atmosphere is considered to be a closed system. Due to this, we can imagine the effect of constant entropy in our life. Here's one example: when you walk on a beach you can feel the effect of heat coming from the Sun, but if the entropy becomes constant, then there will not be any heat transfer between your body and the Sun, and you will not feel the temperate increase in your body. And if there will be no heat transfer from a hot to cold body, then this is a violation of the second law.