Geoengineering Considered Good Insurance

There are so many unknowns when it comes to global climate change.  Questions like how far will temperatures rise and how fast?  What damage will it cause?

Many scientists want to shift away from fossil fuels, perhaps through a carbon tax.  There are other options as well, including removing greenhouse gases from the atmosphere or by reflecting sunlight back into space.  At the same time, some are worried about these \"geoengineering\" techniques because they could cause ozone loss (of the good kind), new weather patterns, crop failure and famine.  

Most agree much more research is needed, and it's an investment worth taking.  But at the same time, many say we can't reject geoengineering in principle because the alternative could be something much worse.