Plants are vital to supporting life on Earth. They release oxygen through photosynthesis and moisture through transpiration, absorb carbon dioxide, provide habitat for animals and humans, and regulate the water cycle. Burning fossil fuels increases the carbon dioxide in the air, but plant ecosystems absorb carbon dioxide, helping to reduce to climate change.  Grasslands, forests, peat bogs, and wetlands are carbon sink ecosystems. Plants are primary producers of food for herbivores, carnivores, and omnivore humans. We must preserve plant ecosystems and prevent habitat loss to preserve endangered species.