Has one of the doomsday scenarios started?

Doomsday! Just like how dangerous this word sounds, similar is what it means! It is the worst nightmare of human life. Doomsday is a day described to happen when there will be no human life on Earth. Yes, it is possible in multiple ways. Being understood what doomsday is, you might want to know the meaning of doomsday scenarios! Doomsday scenarios are those situations or possible ways by which this planet will be left with no presence of human life. These scenarios might or might not happen. But, as said there is slight or more possible for each of it to happen. Some are predicted to happen in millions of years from today and some might just affect the planet way too sooner than that. Also, some of them are just accidents that could happen while some of them take place over a period of time, as a result of …