The biggest threat to deciduous forests is deforestation. Less than 1/4 of the original forests remain due to deforestation. By cutting down trees we gain carbon dioxide. This ultimatley affects our atmosphere, leading to global warming. By every tree we lose, our enviroment becomes a bigger threat to our health. Air pollution is another threat to deciduous forests. The harsh chemicals omitted from factories, poisons both the soil, affecting vegataion, aswell as poisoning the wildlife. If the production of air pollution continues then the enviroment will be at serious threat. everything we as humans do, affects the cycle of life within a deciduous forest.