The investment mechanics of effective giving are complicated. How much to give depends mostly on your personal capacity constraints. For example, if you are saving up for medical school and are about to need to take out $300,000 in student loans, you should probably not donate anytime soon and wait until you have paid back your loans. If you are planning to start a company that will have a big positive impact on the world, you should probably save up to ensure your company has adequate runway. Planning for children is especially hard, and given the cost of raising a child to 18 and funding their college education, it makes sense why so many people fail to donate. Better people than me have established why giving is so obvious and important (The Life You Can Save, Doing Good Better), but I don't necessarily think that 10% of your income is that realistic in all circumstances. Sometimes, it will probably be better and more effective to not donate for three years and then donate 20% of your income for five years. Timing matters, and there are no hard and fast rules when it comes to what to do with your money.
We've established that you should donate, so now we should discuss what to donate to. There are two ways to structure your donation portfolio:
1. Pick and choose a variety of causes that you would like to support
2. Look at the broad level of donations across the board, and donate to the most underfunded
Let's discuss the first option. Let's say that you care about nuclear risk, AI alignment, and global poverty. You don't really care that much about climate change, as it seems a lot of institutions and governments are aware of the issue and are working to combat it. Let's assume that you make a decent salary and donate a lot of it, and over the next 40 years you manage to donate $1 million dollars in total. Nuclear risk and AI alignment are long shots, and we can think of them as risky investments. If you fund an AI alignment company, it is unlikely that you will have a direct impact. Given the complexity of the problem and all the unknowns associated with it (will AGI happen in our lifetime, will it rapidly progress to ASI, will additional funding make any sort of difference) your additional $1 million dollars is unlikely to move the needle much. However, if your contribution happens to lead to some form of research that prevents unaligned AI or makes the ASI treat humanity better over the long term future, you might have a massive impact. Nuclear war and other existential risks (ex: chemically engineered pandemics) are probably also long shots, with a small likelihood of impact but a massive impact if they "hit." These are a bit like buying a lottery ticket, except the actual odds are completely unforeseeable.
Global poverty, on the other hand, is a bit like buying a government bond. GiveWell, my favorite charity in the world, does a tremendous job of finding the most effective charities in the global poverty space. GiveWell does a great job measuring impact, and you can be pretty sure that your donations are saving lives. There are probably some slightly "riskier" global poverty initiatives that aren't sanctioned by GiveWell because their impact is less easily measured, but those I would consider similar to a slightly riskier bond. Why all the investment terminology? I want you to start thinking of your donations as an investment portfolio. All of the same considerations that you think about when planning your own investments also apply here. Instead of a 60% stock and 40% bond portfolio, you should probably be in a 60% global poverty and 40% existential risk portfolio, or something similar. This way, you will ensure that your "investments" are doing good, the 60%, which will help you to continue to donate and feel good about yourself. Also, with the 40% you can ensure that you are intellectually engaged in ex-risk, and I would guess learning and thinking about these sort of topics is way more fun and stimulating.
The counterpoint to this type of investing is bullet point 2 a few paragraphs above, which states that you should really only donate to one cause. Maybe it is the case that one of the ex-risks facing humanity is extremely underfunded. Maybe the "bang for buck" of nuclear risk charities is way higher than other areas, and even a small donation could tip the scales greatly towards averting a nuclear war. Unlike traditional investing, we are all in this together. The aggregate, global portfolio is really what matters and what determines the allocations to specific causes. In this case, you should focus all of your donations on this one "undervalued" investment. The problem is, I find it hard to believe anyone can adequately forecast how important each of these issues is relative to each other. From my conversations with alignment research companies it seems that they are actually overfunded, and they have quite a bit of cash just sitting there doing nothing. In that case, donating to them contributes effectively nothing, whereas you could donate to global poverty and have an impact. Still, in my opinion AI alignment is by far the most pressing issue facing humanity, and this issue will have a direct impact on all other ex-risks and even long term global poverty. However, I'm not quite sure where to donate, and I want to be sure I'm not just providing funding for someone to quit their job to learn about AI for 3 months and then start an unsuccessful AI alignment blog. Also, I want to be careful I'm not actually contributing to capabilities research and making the problem worse. So, what should we do?
I pretty much stick by some blended portfolio of causes, such as a 60/40 portfolio of global poverty and ex-risk. Diversification is very important, and it is easy to have horrendous results if you put all your eggs in one basket (imagine you find out that the single charity you have been donating 10% of your income to for the last 20 years is stealing money or spending it very ineffectively). I think there should be some short term, easy "wins" such as GiveWell in any portfolio, so that you can be sure you are making a positive impact. Then, with some leftover cash you have some fun and swing for the fences, and maybe contribute very positively to humanity's long term future. Happy investing!