The bigger the issue, the smaller you write. Remember that. You don't write about the horrors of war. You write about a kid's burnt socks lying on the road. You pick the smallest manageable part of the big thing, and you work off the resonance.
The fresh and earthy scent that is produced when rain falls has a name. It is called “petrichor” from the Greek words “petra” meaning stone and “ichor” which refers to the fluid that flows like blood in the veins of the gods.