Throwing in my $0.02, a correlation study is technically an option, where you look at differences as microplastics increase in concentration. But. my instinct is you would see some really unfortunate covariance - that is, another variable that increases (or decreases) at the same time as microplastics and is known to impact your variable of interest, e.g. socioeconomic status.

In grad school I worked with MRI data (hence the username). I had to upload ~500GB to our supercomputing cluster. Somewhere around 100,000 MRI images, and wrote 20 or so different machine learning algorithms to process them. All said and done, I ended up with about 2.5TB on the supercomputer. About 500MB ended up being useful and made it into my thesis.

Don’t stay in school, kids.