Human Impact: Deforestation The biggest threat to Coniferous Forests is deforestation. Biodiversity Effect: The biggest threat caused by deforestation is the loss of habitat for the animals and other biotic organisms that live there. It also impacts the non-living features (abiotic) in an ecosystem. For example, deforestation causes soil erosion, which leads to less nutrient filled soil for new plants to grow. An other effect on biodiversity is the change in climate. As more trees are cut down, less water vapor is able to return to the atmosphere, reducing the amount of rainfall. Human Impact: Acid Rain Acid rain is rain (or it can occur in the form of snow, fog, and dry materials) that contains higher levels of nitric and sulfuric acid.
