Not 2020, but 536 AD was the worst year for humanity; Here's why As darkness, chaos, and famine spread all across the globe in 536 AD, several people died in their swathes Was Pentagon researching on alien and UFO-related incidents? Due to the coronavirus pandemic outbreak, several people reckon 2020 as the worst ever year for humanity. Even though COVID-19 posed an unprecedented challenge for mankind, researchers believe that 536 AD still remains the worst-ever year for the entire humanity. The world went cold in 536 AD According to researchers, the entire planet was pulled into complete darkness in 536 AD following a volcanic eruption in Iceland. As the debris and ash gulped the earth's atmosphere, the planet was plunged into total darkness which lasted for more than 18 months. Records show that a mysterious fog enveloped Europe, the Middle East and parts of Asia.