Google investing in some eye-popping projects
latimes.com
latimes.com
Alternatively, on that day, you can find another cool job at another geek-run successful technology company(if you are any kind of hacker, which you probably are if you are working on these cool projects). Once this happens, you probably don't want to keep working at Google and see a great company decline to yet another middle manager driven MegaCorp. (There is some debate on whether this process is underway there already).
Google consumes a huge amount of energy for their massive server farms. Is it surprising they are investing in solar and wind energy? I don't think it is much different than the airlines trying to hedge fuel costs.
Google's primary competency is software engineering. Is it surprising that they are working on cars that drive themselves? That is defintely a lucrative problem and they are well positioned to tackle it.
There are plenty of other companies with smaller market cap than Google and a wider portfolio - just look at Yamaha (musical instruments to small gasoline engines? really?) or even Microsoft.
I think it is a good thing, maybe the 21st century Bell Labs.