Here on Earth, we have been dealt many problems or oppositions that eventually we learned how to overcome. Problems as constant as night and day or as complex as elevation. Ever since the primitive times humans have faced oppositions and figured a way to simplify things. An example we see in modern days is when we have a dark city or dark street which resricts visibility. To solve this opposition one would simply have to add lights to the city or street to make them safer, comfortable, and more liveable.
Another opposition we see that correlates with man and land is elevation of land. Near the New Orleans area there is only 45% of the land that is above sea level. The city itself is the third lowest point in the United States. Being next to a large body of water where hurricanes are known to strike they needed a way to prevent water from flooding the city. Building a levee system created a wall around the city preventing water from entering. Recently, we see that a recent hurricane strike caused a lot of damage to the levee which caused the city to flood.
A different opposition we can find is opposition of gravity and movement. How would one get from the first floor to the eightieth floor? One of many methods to get from point A to point B, but one in particular would be putting in an elevator. This would be an easy way that would solve the problem and would solve the problem against gravity.
As shown here there are oppositions humans will face and it takes a simple modification or addition to solve the problem. These aren't the only oppositions in this world. There are way to many oppositions to list so I just gave you the basics.
In the following link we see a word document with pictures describing the oppositions listed above.