-they concerned
The word atañeran is the imperfect subjunctive form of atañer in the third person plural.
See the full atañer conjugation


Éstas son razones de peso que atañerán a la labor que se haga en virtud del Protocolo Facultativo de la Convención.
These reasons seem to have force with relation to the work under the Optional Protocol to the Convention.
Incluso así, habrá muchas cuestiones ambientales que no atañerán a las esferas de actividad básicas del PNUMA y el PNUMA no las abordará, las abordarán otros asociados y el PNUMA actuará como intermediario.
Even then, there will be many environmental issues that fall outside of the UNEP core areas of work and these will not be addressed by UNEP but by other partners, with UNEP acting as a broker.
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