Dear EarthTalk: When we talk about “endangered species” we usually think of animal species, but someone recently told me that there was a worldwide crisis pertaining to the extinction of plants. Can you enlighten? -- Max Blanchard, East Islip, NY
We may not realize it, but the health of the plant kingdom is crucial to the health of the planet and the animal life (which includes humans) it supports. “Through photosynthesis, plants provide the oxygen we breathe and the food we eat and are thus the foundation of most life on Earth,” reports the Center for Biological Diversity, an Arizona-based nonprofit dedicated to securing the future for endangered plants and animals throughout the world.