I heard about the Doomsday Clock that shows how close we are to the end of the earth. This clock was designed to give a warning to the world. It was created in 1947 to alert people to nuclear threat. Climate change was added in 20007. It was set at 100 seconds until midnight in 2021.The time is decided by scientists every year. It is seconds this year and last year. But it used to be minutes. When the clock ticks at midnight, it means that the world is destroyed by nuclear war or climate change. British prime minister Boris Johnson cited this clock in his speech at UN climate change conference in Glasgow. The doomsday of the earth is predicted in several religions. Christian bible predicts that the earth will be destroyed at the time of Jesus Christ's second coming and rebuilt as a heaven after 1000 years since then. It is likely that human beings are instinctively in fear of the world being destroyed.