Humans' impact on the Earth has been 
so profound that many scientists are now referring to a new geologic epoch, 
the Anthropocene. Arguments for this new era are found in such changes as 
climatic forcing through greenhouse gas emissions as well as 
upsetting the nitrogen cycle due to an ever increasing population. A dynamic resource for being able to see what this actually looks like is 
A Cartography of the Anthropocene. The website, created 
by Globaïa, features a  variety of maps demonstrating the human effect at the global scale. My favorite, pictured below, is a map of the global transportation system.
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| The Global Transportation System. Globaïa "is a global education organization whose mission is to foster a consistent and informed participation of citizens in environmental issues by understanding the multiple dimensions of today's world and its likely future."  |