has been reacting
Present perfect progressivehe/sheconjugation ofreact.

react

Mr President, since 1992, the international community, or a substantial part of it, at least, has been reacting to and combating one of the greatest environmental and economic challenges facing mankind: climate change.
Señor Presidente, desde 1992 la comunidad internacional, o por lo menos una parte importante de ella, ha tratado de responder y luchar contra uno de los mayores retos medioambientales y económicos a los que se enfrenta la humanidad: el cambio climático.
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