I did some quick Googling and could not figure out what the plan is for doing this economically. There are thousands of pieces of debris scattered over thousands of orbits, and the fuel cost of transfers to many orbits are prohibitive. That's why most of the debris-cleanup ideas I was familiar with involved lasers or other techniques that don't require the cleanup satellite to match orbits with the debris. So what's the strategy here? Just clean up a few of the most highly trafficked orbits? Anyone got a link?