Via the Lifeboat Foundation, here’s a good list of things we can do to make sure the human race survives. (Hint: Make sure the Hadron Collider doesn’t shit itself!)
1. Create the book “Guide to the restoration of civilization”, which describe all the necessary knowledge of hunting, industry, mining, and all the warnings about the risks for the case of civilization collapse.Test its different sections on volunteers. Print the book in stone / metal / other solid media in many copies throughout the world. Bury treasure with the tools / books / seeds in different parts of the world. 1-100 million USD. Reduction of probability of extinction (assuming that real prior probability is 50% in XXI century): 0.1%.
2. Collect money for the work of Singularity Institute in creating a Friendly AI. They need 3 million dollars. This project has a maximum ratio of the cost-impact. That is, it can really increase the chances of survival of humanity at about 1 percent. (This is determined by the product of estimates of the probabilities of events – the possibility of AI, what SIAI will solve this problem, the fact that it chooses the problem first, and that it solves the problem of friendliness, and the fact that the money they have will be enough.)
3. Krisave in the ice of Antarctica (the temperature of -57 C, in addition, you can create a stable region of lower temperature by use of liquid nitrogen which would be pumped and cooled it) a few people, so that if on earth there another advanced civilization, it could revive them. cost is several million dollars. Another project on the preservation of human knowledge in the spirit of the proposed fund by LongNow titanium discs with recorded information.
4. Send human DNA on the moon in the stable time capsule. Several tens of millions of dollars. You can also send the criopreserved human brain. The idea here is that if mankind would perish, then someday the aliens arrive and revive people based on these data. Expenses is 20-50 million dollars, the probability of success of 0.001%. Send human DNA in space in other ways.