You can also shift to work for an institution which is genuinely trying to do good, such as the World Bank or a not-for-profit. Or you can do what you can from within your own organisation to get them to be working to improve the world rather than take advantage of it.
(1) http://blogs.hbr.org/2013/11/what-problem-will-you-own/
<update - my apologies, there is a registration requirement for the article. The lightbox appears after a little wait, so you should be able to read it>
