MANKIND
Life-Death
Everyone has relatively short life span. If a superman or superwoman (fictional character possessing “super long life”) look at the world every 200 years, he or she would notice no one is the same as 200 years before.
Rich-Poor
Almost every activity in the society requires money. We spare our time for money and/or with money (either selling or buying). The minority are rich and the majority are poor. (Lack of) Money creates social problems.
Love-Hate
The relationship between each one of us involves love and/or hate. Unity often incite love but separation incite hatred.
THE EARTH
The earth condition directly or indirectly contribute to the life-death, rich-poor if not love-hate of mankind.
For example, natural disaster in populous city may kill hundreds if not thousands. (life-death) Natural resources and earthly produce may bring rich income. (rich-poor) The beauty of the nature and flora/fauna may offer a enjoyable experience to observers. (love-hate)