1.) everything that can be observed or explained scientifically. - natural phenomenon
2.) a well-supported explanation of all the evidence related to a natural phenomenon. - Theory
3.) the procedure of scientific inquiry used to investigate natural phenomena. -scientific method
In my opinion, nuclear war will is the biggest threat and we need to prevent that from happening. If a nuclear “world” war does occur, the war would end up killing every or most of the world population, as well as other living things of course. Instead of expanding our own nuclear energy, we should focus on making and upgrading nuclear bunkers to shield us from the war and radiation.