Crop circles - idiot teenagers or alien spacecraft?

In the early 1980's, many farmers in southern England have been noticing wierd formations in their crops, otherwise known as crop circles. These crop circles would often follow a sighting of a UFO only moments earlier, making the connection to UFO's and crop circles. However, two hoaxers have claimed to make all of the crop circles in southern England, getting rid of the possibility. Although, this does not explain the wierd formations in Japan, Sweden, Canada, etc. Also, the crop circles known to be created by humans would quickly vanish, yet the ones created by unknown, could take more than 6 months to vanish. Moreover, the "spheres of light" that were seen before many crop circles have been explained as, for simplicity, balls of energy in the sky, a scientific phenomenon.

This article in The Canadian is actually very interesting. It is one of the few ideas brought up by UFOologists (yes, that's a word) that has yet to be fully explained by scientists and UFO skeptics. The UFOologists may claim that these spheres of light seen before crop circles is perfect evidence, but it doesn't at all fit in with other sightings. Scientists claim these spheres of light as a new phenomenon yet to be explained, and are looking further into this.

Kingston, David. "Former British Royal Air Force official saw Alien Orb create Crop Circle." The Canadian (2007).