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A recent study has indicated that if the near-Earth asteroid Bennu were to collide with our planet in September 2182, it could lead to significant global devastation. Researchers from the IBS Center for Climate Physics, led by Lan Dai, modeled the consequences of a potential impact by Bennu, which measures approximately 490 meters (1,600 feet) in diameter. According to their simulations, the collision could inject between 100 to 400 million tons of dust into the atmosphere, resulting in an “impact winter” characterized by reduced sunlight, lower temperatures, and decreased rainfall lasting three to four years.
The study, published in the journal Science Advances, states that Earth's average surface temperature could drop by around 4 degrees Celsius (7 degrees Fahrenheit), while rainfall might decrease by 15%. Such conditions would severely hinder plant photosynthesis, potentially reducing it by 20-30%. Though the estimated probability of a Bennu impact is low at 0.037%, the long-term consequences could threaten food security globally, resembling climatic disruptions from the largest volcanic eruptions in recent history.