The phrase "green earth" is a metaphorical expression that means the planet Earth, particularly in its natural state or untouched by human activity. Full definition
I want a self sustained peacefully spot on the good green earth and leave the city behind. (treehugger.com)
«This agreement enables us to deliver the latest science and commentary on the global climate change issue to thousands of additional people,» said Fred Palmer, president of Greening Earth Society. (desmogblog.com)