Some human will never appreciate with what they have. It will never be a problem unless it involves others feeling. Personally,i strongly believe we have to learn to appreciate things around us. No matter what size it involves or things that it touch. If everyone know how to appreciate,the world will be a better place to live.
Appreciate others consume time and effort to be learn. Plus,it have to be added with some sincerity in it. If not, our appreciate will be a fake and worthless.
Think in this way, divorcing,arguing,fighting,social illness,political crisis, and even war between countries constantly rising in this world because people do not try to appreciate with each other.
Alas, if everyone know how to appreciate...