The study by J. Shukla, C. Nobre, and P. Sellers examines the effects of Amazon deforestation on regional and global climate using a coupled numerical model of the global atmosphere and biosphere. The model simulates the replacement of tropical forests with degraded grassland, leading to significant increases in surface temperature, reductions in evapotranspiration, and precipitation over Amazonia. The dry season lengthens, making it difficult to reestablish tropical forests after deforestation. The removal of Amazonian forests also impacts species diversity and atmospheric chemistry, as the region is a critical natural sink for ozone and plays a significant role in global tropospheric chemistry. The study highlights the complex interactions between the atmosphere and biosphere, emphasizing the potential for large-scale perturbations in either component to alter the dynamic equilibrium of the climate system. The results suggest that rapid and complete destruction of Amazonian tropical forests could be irreversible, with profound ecological implications, including increased forest fires and disrupted plant-animal relationships.The study by J. Shukla, C. Nobre, and P. Sellers examines the effects of Amazon deforestation on regional and global climate using a coupled numerical model of the global atmosphere and biosphere. The model simulates the replacement of tropical forests with degraded grassland, leading to significant increases in surface temperature, reductions in evapotranspiration, and precipitation over Amazonia. The dry season lengthens, making it difficult to reestablish tropical forests after deforestation. The removal of Amazonian forests also impacts species diversity and atmospheric chemistry, as the region is a critical natural sink for ozone and plays a significant role in global tropospheric chemistry. The study highlights the complex interactions between the atmosphere and biosphere, emphasizing the potential for large-scale perturbations in either component to alter the dynamic equilibrium of the climate system. The results suggest that rapid and complete destruction of Amazonian tropical forests could be irreversible, with profound ecological implications, including increased forest fires and disrupted plant-animal relationships.