crop circles, i have heard all the theories, the skeptics and the believers, in then end i don't hold faith that these are created by aliens but neither do i believe these are the product of man. this is my theory of the crop circle phenomenon.
if you believe that the earth is indeed an intelligent and conscious entity (gaia) then it stands to reason that in some point in time it will awaken to human activity and consciousness and communicate in some form.
when one looks at crop circles the big surprise is these blades of grass or wheat are on the outside untouched but in theory individual centres they indicate a high thermal signature, they have been altered from the inside. the patterns are complex and mathematical, they occur instantly and usually in the northern hemisphere. to me this is the earth communicating to us, we don't yet have the ability to understand the message, it may be just a greeting or some way of saying, 'hey we are all in this together so be environmentally aware.'