I'd like to solicit advice since I'm starting at Stanford this Fall and I'm interested in optimal philanthropy.

First off, what should I major in? I have experience in programming and math, so I'm thinking of majoring in CS, possibly with a second major or a minor in applied math. But switching costs are still extremely low at the moment, so I should consider other fields.

Some majors that could have higher lifetime earnings than straight CS:

Petroleum engineering. Would non-oil energy sources cause pay to drop over the next 40 years?
Actuarial math. If I understand correctly, actuaries had high pay because they were basically a cartel, artificially limiting the supply of certifications to a certain number each year. And I've heard that people that used to hire actuaries now hire cheaper equivalents, so pay could be less over the next 40 years.
Chemical engineering, nuclear engineering, electrical and electronics engineering, mechanical engineering, aerospace engineering.
Pre-med.
Quantitative finance.

Thoughts?

Stanford actually has salary data for 2011-2012 graduates by major. CS has highest earnings, by quite far. The data is incomplete because few people responded and some groups were omitted for privacy, so we don't know what e.g. petroleum engineers or double majors earned.

Should I double-major? There are some earnings statistics here; to summarize, two majors in the same field doesn't help; a science major plus a humanities major has lower earnings than the science major alone; greatest returns are achieved by pairing a math/science major with an engineering major, which increases earnings "up to 30%" above the math/science major alone. I'd guess these effects are largely not causation, but correlation caused by conscientiousness/ambition causing both double majors and higher earnings.

I could also get minors. I'm planning to very carefully look over the requirements for each major and minor, since there do seem to be some cheap gains. A math minor can be done in one quarter, for instance; a math major takes only a bit more than two quarters.

I have a table with the unit requirements of each combination of majors and minors. Most students take 15 units a quarter. Here are some major/minor combinations I could do:

If I take 18.8 units a quarter, I could double-major in CS and econ.
If I take 15.8 units a quarter, I could major in CS and minor in ma

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