Debris Intercept Towers
Using launch loop "dynamic structure" technology
Some have suggested using launch-loop-style towers as elevated gantries for orbital rocket launch, bypassing the 200 to 600 m/s atmospheric drag losses of vertical launch from the ground. I hope they do the math - rockets are heavy. The gantries and water-sprayed flame ducts and makeup propellant tanks associated with a launch pad are far heavier.
That said, the notion inspires my favorite phrase, which I hope to hear from many of you, backed by physics and calculation:
That won't work, but this will!
An important, expensive, and neglected space mission is de-orbiting space debris from Low Earth Orbit. I include the spent upper stages used to loft satellites into high orbits, like the Russian Molniya comsats; those derelict upper stages come bombing through LEO at high speed, threaten enormously expensive assets like ISS.
Deorbiting an object means dropping the perigee of its orbit down into the atmosphere, and the best way to do that is to reduce apogee velocity. The second best way to do that is to reduce perigee velocity so much that apogee becomes the new, lower perigee. That requires delivering a lot more delta V, but it may