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Who Speaks for Earth?

Carl Sagan once famously asked the question, "Who speaks for Earth?" It turns out that there are thousands—and perhaps millions—of humans who very actively and vocally speak for Earth on a daily basis. Chief among them, through their life's work, are distinguished luminaries and visionaries such as Carl Sagan, David Attenborough, Richard Leakey, Stevie Wonder, Jacques Cousteau, Maurice Yeates, and the Bulletin of the Atomic Scientists.

There are lesser known humans who also speak for Earth in their own unique ways, for instance, the many environmentalists and environmental organizations. The marvelous photographs of Earth and life on Earth, as showcased in the slideshow below, are representative of lesser known humans—in this case photographers—who also speak for (the beauty of) Earth.