Climate Change Novella

I am currently working on a Novella while I wait for my Novel to mature in a nice cool secluded place. It's a bit of a gap-project before I go back and rework the novel, which needs lots of work following some critical feedback I got from some great critics and personal friends.

All projects have problems and my Novella is no exception. It's a highly ambitious project based on metaphors and tells the story of climate change without all the technical stuff.

I currently have the setting, the main characters, the major plot developments, the ending, the theme and main messages are clear, the conflict is also reasonably clear and is based on a series of conflicts. One would expect that with all these things in place the task of writing should be easy now - but it isn't. I'm still struggling. So what's the problem? This isn't classic writer's block - "I want to write but don't know what to write".

My challenge is exactly how to get the main message and theme across. I applied some alpha wave thinking today to trying to solve the problem but I haven't solved it all yet. This is the scary space of writing - trying to make a good idea come to life.