Today on This Green Earth, environmental writer, UCLA Institute fellow, and author of Rambunctious garden Emma Marris talks about what "nature" means in a changing world, what counts as nature and what it means to protect it. In addition, Professor Marris will discuss her recent New York Times op ed on her five-step plan on how to tackle climate change calmly once and for all. Professor Marris will address all this in a talk she is giving at The Natural History Museum of Utah Tuesday night. It's