Sometimes I'll hear a phrase or a word and write it down in my little black notebook (a writer's best mate), then come back to it and work a plot around it. ↗
There are plenty of problems in the world, and doubtless climate change - or whatever the currently voguish phrase for it all is - certainly is one of them. But it's low on my list. ↗
When I was young, I had one of those Yamaha drum machines, and I used to practice to that quite a bit, just to practice soloing and being in time and completing all my phrases. ↗