Don't get me wrong. I have always supported environmentalism: I frequently walk to work and I compost, often both at the same time. In spite of this or because of this, I really don't like when people say we are destroying the planet. Sure if we continue as we have, we could destroy human civilization as we know it, but that doesn't mean the planet will even notice.
We couldn't even wipe out all life on earth if we tried. But if we did, tectonic subduction will happily continue, as will the Van Allen belts. Drastic climate change is nothing like the kinds of change that the Earth has done to itself for kicks!
Similarly, it bugs me when environmentalists want us to believe that green is the colour of the earth. Without making assumptions, is this true? Well obviously not. Most of the surface of Earth is water (blue) or glaciers (white) or clouds (also white). There are some big beige deserts. People live in lands that are green and lands that are brown.
When you mix them up, you get turquoise: the RGB colour (23, 57, 61). Notice that the "B" part of the RGB value is the biggest.
In a deeper way, in a less human-centred way, we could consider that most of the earth is not the surface. So the question becomes: What is the average colour of the volume of the earth?
Surface:
http://www.jeffreythompson.org/blog/2014/08/13/average-color-of-the-earth/
-from space (with clouds): green, brown, blue and white.
Interior:
light-orange (#ff932c see below)
See: http://www.vendian.org/mncharity/dir3/blackbody/
See: https://en.wikipedia.org/wiki/Geothermal_gradient#/media/File:Temperature_schematic_of_inner_Earth.jpg
Calculations
At an "average" distance of r=1/(the cube-root of 2)= 0.79 approx aka 5057km aka depth of 1314km the colour is 2200K = #ff932c [29% of depth between 660km and 2900km. 29% temperature between 1900k and 3000k is 2200k]
Additionally:
The Earth created and shaped civilization: Tectonic Environments of Ancient Cultures (http://tectonic-culture.blogspot.ca/2013/05/tectonics-and-ancient-civilizations.html)