This is the 10811th most frequent Polish word.
działających
"Operating" or "functioning."
In this sentence, 'działających' is used as a present participle (acting, working) referring to people who are actively involved in a certain task, modifying 'people'.
Odwiedziliśmy warsztaty ludzi działających lokalnie na rzecz ochrony środowiska.
We visited the workshops of people actively working locally for environmental protection.
Here, 'działających' refers to experts who are engaged or active in various fields, modifying 'experts'.
Zdania działających w różnych sektorach ekspertów były podzielone na temat rozwoju technologii.
The opinions of experts active in different sectors were divided on the topic of technological development.
In this usage, 'działających' is describing organizations that are performing actions aimed at education.