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There are no black swan events with respect to steller physics mentioned in astronomy.Every phenomena has been pretty well explained as far as I know,within a year of the state-of-the-art.[1]
Education is a good idea.We presently don't have any.
Globalization is another good idea,as we face challenges of global scale.[2]
Terra-forming the Sahara would be challenging.Seems like we'd be looking at geologic time frames.[3]
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[1] Ten known recurrent micro-nova in 100 years of observation. That's a small sample size. Covered in the first three minutes here (then it goes on to the age of the Sphinx. I know your opinion of S0):
Back ontopic at 10:08.
[2] Do you know of C. S. Lewis' Two Cultures argument?
[3] The Sahara was created within human history. Isaac Arthur suggests if we pay for the energy instead of getting it for free from the Sun, it can be 1000 times as efficient. [shrug]