A study by the University of Alberta has found that perennial rye crops absorb significantly more carbon dioxide from the atmosphere than annual crops. The research, published in Agricultural and Forest Meteorology, found that a four-hectare plot of perennial rye absorbed the same amount of CO2 as a vehicle burning 35,000 liters of gasoline over two years. The study also noted that the perennial crop did not use more water than the annual crop, addressing a potential concern. This research adds to the growing body of evidence supporting the environmental benefits of perennial crops, including their ability to mitigate greenhouse gases and store carbon in the soil. However, more research is needed to address challenges such as increasing yield, dealing with disease, and improving winter survival to make perennial crops more reliable and widely adopted.