The very survival of the human race (in fact of all the animals) is challenged without plants. Apart from being the source of food and nutrients for all the animals on the planet, plants keep the environment healthy by absorbing carbon dioxide and reducing global warming. The infographic below depicts some quantifiable as well as unquantifiable benefits of plants:
Infographic via: http://www.thegardencentral.com/plant-garden/benefits-of-plants/
