CORRESPONDENCE 28 April 2026 By Marina Fleury E.DNA TecBio, Piracicaba, Brazil. Your News feature on airborne environmental DNA (eDNA) suggests the technology could link “the whole [of] biodiversity, the whole world together with a single assay” (see Nature 652 , 556–558; 2026 ). I welcome this optimism, but wish to highlight a paradox: the regions in greatest need of biodiversity monitoring are least equipped to deploy the technology in its current form. Access options Access Nature and 54 other Nature Portfolio journals Get Nature+, our best-value online-access subscription $32.99 / 30 days cancel any time Subscribe to this journal Receive 51 print issues and online access $199.00 per year only $3.90 per issue Rent or buy this article Prices vary by article type from $1.95 to $39.95 Prices may be subject to local taxes which are calculated during checkout Additional access options: Log in Learn about institutional subscriptions Read our FAQs Contact customer support Nature 652 , 1420 (2026) doi:…