Chapter 18

If each of the four axes in the Myers-Briggs type happened to be equally ${}^{41}$ likely-that is, $50\mathrm{\%}$ chance of being $I$ and $50\mathrm{\%}$ chance of $\mathrm{E}$, etc., and uncorrelated, then how probable would you expect each of the 16 types to be, in percent?

How might you propose getting people of all personality types on board with a collective campaign to fight a credible future threat that may involve sacrifice and the recognition that our own habits are part of the problem?

Let's say you have decided to reduce your footprint ${}^{48}$ in some way. You run into someone who challenges your choice, pointing out that your effort is so small in the grand scheme of things that it cannot make a credible difference, and others will just use more- offsetting your sacrifice. Do you believe that is correct? If not, what argument would you offer in support of your decision?

Let's say that the U.S. were willing to divert a one-time investment of 10 qBtu out of its 100 qBtu annual energy budget toward building a new energy infrastructure having a $10:1$ EROEI and a 40 year lifetime. How many qBtu will the new resource produce in its lifetime, and now much per year? How many years before the amount of energy put in is returned by the output?

The Milky Way has about 100 billion stars $\left({10}^{11}\right).$ If $50\mathrm{\%}$ of stars have planetary systems, $10\mathrm{\%}$ of those have a rocky planet in the habitable zone, $10\mathrm{\%}$ of those are in benign ${}^{52}$ environments, $0.1\mathrm{\%}$ manage to produce life of some form, and $0.1\mathrm{\%}$ of those result in intelligent life, how many instances of intelligent life might we expect to emerge in our galaxy?