While scientists calculate the long-term prognostics for the health of the planet, artists continue to take the natural world--and its fate--as both a medium and a subject in their work. The Natural World Museum and the United Nations Environment Programme have gathered a group of 79 such examples in the volume Art in Action: Nature, Creativity, and Our Collective Future. Representative projects range from the crowd-pleasing site-specific work of Christo and Jeanne Claude to Olafur Eliasson's immersive provocations--just in time for a recently-opened mid-career survey of his work at SFMOMA--and the book is separated into sections that track artists rendering nature as everything from a fantasy Eden to a fallen wasteland of unchecked human development. The title makes the book's overall purpose clear. As much as it documents individual projects that engage with and manipulate ecology, the intent is a cumulative attempt to draw awareness to the ever-more fragile state of the planet.