Great question! I could go all day with this (sadly) but let's do two to start...

- Ukraine -- People know about it, and I just spent boots-on-the-ground there. I don't think people get the contagion effects from it -- everything to food to energy. Even if there was a ceasefire tmrw, you'd still have explosive ordinance, which will potentially be a multi-decade problem.

- Pollution/environmental pressure -- A lot more people know about this issue, but the local effects of this are kind of crazy. I just did a sea turtle conservation mission. Basically, not enough sea turtles means too many jellyfish, which throws off the balance of the entire ocean ecosystem. It's another case of one issue having multi-order effects.