Imagine: What will be Ended the World?
Energy Shortage: oil and other natural resources exhausted will be human catastrophe. If we could explore out other energy, we can avoid this disaster. But nobody knows what will happen if we can’t find new alternative energy. One possible situation is human will fall back to the dark ages or the Stone Age after we exhausted fuel and resources. Many people believe that’s unlikely to happen, but at least this is a good material for science fiction.
Sunlight: if the sun’s energy output suddenly increasing or decreasing, this is a huge devastating for all the life in earth. Unfortunately, human know little to the sun, and it is hard to eliminate this threat.
Black Holes: it is well known that a black hole is “some fixed stars will collapse under their weight after they are getting bigger, and the substance drop to the center until form a black hole.” In the black hole, nothing can come out, even the light. If the black hole go through the earth, everyone will be dangerous.
War: there are big possibility in the future that human will be ended by themselves. If humans want to survive, we should learn to get along well with others. Nuclear weapons, intercontinental missiles, unmanned weapons and other new technologies have greatly reform the war way. Therefore, love the earth and love ourselves.

