I saw Snowpiercer, no thank you.
Snowpiercer itself arguably doesn't hold an opinion about stratospheric injection of aerosols because it's used as a setting for an allegory.
The bar is pretty clear: did experts in the field make the story, make the film with an intent of educating, and get the final word in the creative process? If all yes then it isn't to be lumped in with allegories about classism.