Geo Engineering: Too Good To Create Global Havoc?

I first learned about geo-engineering several months back in an article in Foreign Affairs. The idea is that you can change global temperatures by manipulating the climate. This can be achieved by putting salt or sulfur into the atmosphere. Many have questioned the science and if it can actually be done at a massive level. This is an article in the BBC from today that says it can be done.

I have been following this because the concept seems very interesting to me. However, at a visceral level, I can't help but think - don't mess with mother nature. I am not so sure we can even begin to comprehend what the unintended consequences might be.