Keith Henson proposes “…the design of a moving, non-tapered space elevator cable threaded through a system of pulleys that increase the number of supporting strands as the space elevator approaches geostationary orbit (GEO)”.
He gives a link to, I guess, a posting of this paper on the LiftPort forums but for some reason I can’t access it. I know the idea of a pulley system has been floated around in the past – this is just the latest posting I’ve seen on this subject.
Until I can read the actual paper, I can’t comment on it. But the abstract, accessed here, sounds interesting…
A rebuttal from David Stodolsky states that “While solar power satellites could make a contribution, they are not going to solve climatic problems. And as ongoing European Space Agency studies show, no new technology, such as space elevators is needed to activate the plan.”