What would be an optimal size of a city and why?

Energy, transportation, waste management, social services, employment, food, production, politics, economics, entertainment, are all factors in what would be affected. What do you think would be an ideal size range for a city?

What are the valid reasons to oppose the development of alternative fuels.?

Recently there have been several questions and answers raising concerns about the use of alternative fuels. To this end, different claims were made but they tended to be poorly cited and erroneously portrayed.

So… what are the genuine reasons that people have for opposing wind, solar, tidal, geothermal energy.

And please, opinions are fine but if you’re going to state ‘facts’ then please substantiate them with credible links.

Should i pursue a PhD in Pharmacy ? and a PhD in Renewable energy engineering?

should i pursue a PhD in Pharmacy? and a PhD in Renewable energy engineering? or should i get masters degrees for the two fields?

How do I enter the renewable energy industry?

I just left my job as an online advertising manager for a successful online retailer. My personal interests and sense of responsibility to help save our planet have prompted me to seek an opportunity in the renewable energy industry.

Does anyone have any advice on how I can break into this hot new field? My background is journalism and a specialization in online channel partners, especially eBay, Amazon, and Shop.com.

Thanks!
Erik