Which methodology did Avaaz use to conduct its research on YouTube?

Avaaz examined the videos YouTube recommends to users when they search  “global warming,” “climate change,” or “climate manipulation” on the platform. We specifically focused on videos YouTube suggests to users in its ‘Up Next’ feature, and in the suggestions bar, below the video on the mobile app, and on the right side of the screen on desktop. YouTube’s promoted videos drive the vast majority of what users watch on the site.