Wow. We could have colonized the entire solar system, cured every form of disease, erased famine, or all of the above... the possibilities are almost limitless, if we devoted that amount of time-relative energy into any one of those.
This... this is just sad. I hope future generation can look upon us with pity rather than disgust. Especially on those Koreans. Hehehe.
Now I wonder how much collective time has been put into MMORPGs. Hell, even WoW alone. I bet we could have built enough pyramids to cover North Africa by hand in that time frame.