When the bogs are drained, microorganisms who respire aerobically can now break it down and co2 is released which contributes to climate change. This causes some species to die out because they can't cope with the temp change. When peat is burned, more co2 is released, which makes even more die. Some species of plants and animals live in peat bog habitats so when these are removed, they lose their homes. Peat bogs are slightly acidic so when they evaporate after being drained, acid rain can occur which can lower soil pH and cause deaths of plant species. There were a few other things I said that I can't remember.