Ash could block sunlight so much that photosynthesis would be reduced and global temperatures would plummet.
(Ash; could block; sunlight; so much that photosynthesis would be reduced and global temperatures would plummet) (photosynthesis; would be reduced; ) (global temperatures; would plummet; )
Ash photosynthesis global temperatures
could block would be reduced would plummet
sunlight so much that photosynthesis would be reduced and global temperatures would plummet