Engineering Earth 'is feasible'

This article from the BBC lists some methods for carbon reduction currently being considered by governments and scientists.  Not to sound like a Luddite, but the implications of some of these technologies sound dangerous and shortsighted.  Injecting saltwater into clouds? Storing carbon underground?  Carbon-capturing devices that simply remove carbon from the ecosystem, rather than recycle it back into oxygen via plants?

Really, sometimes the most simple solutions are the easiest.  The article states that inaction now is caused not by limitations in our ability to cope with environmental problems, but by an inability to effectively legislate and cooperate with cross-border initiatives.  It warns that if we don't get our act together now, these harsh engineering solutions may be our only options in the future.