A Laddermill is a kind of windmill, an "Airborne wind turbine", that consists of a "ladder", a long string or loop of "kites". The loop or string of kites on the ladder is launched in the air by the lifting force of the kites, until it is fully enrolled, and the top reaches a height of about 30.000 feet. In a 2007 "road map" report on renewable energy adopted by the European Parliament, laddermill technology was listed among various "promising and challenging" new energy sources into which revenue from emissions trading could be reinvested. [1]