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Volunteer river cleanups, once focused mainly on removing visible litter like bottles and bags, have increasingly incorporated data collection as a secondary goal. Organizers now ask volunteers to log the type and brand of debris found, information later compiled into reports sent to manufacturers and local policymakers. This shift reflects a growing view that cleanups alone cannot outpace the steady inflow of new waste, and that identifying recurring pollution sources is necessary to reduce debris at its origin. Some cleanup groups have used their brand-audit data to push successful campaigns for extended producer responsibility laws, which require companies to help fund the collection and recycling of their packaging. Critics note that data collection can slow down the cleanup itself, requiring volunteers to sort and record rather than simply bag and remove.