The hotel group completed a certification process to achieve its new status, which is endorsed by the United Nations Educational, Scientific and Cultural Organisation (UNESCO).
Announcing the accolade alongside UNESCO representatives at a press conference in Spain, Sol Melia vice-chairman Sebastian Escarrer said the accreditation was the result of a global sustainability policy that had been implemented over the course of several months.
Sol Melia's initiatives included an electronic billing project to limit waste paper, a commitment to source 90% of purchases from local suppliers and a system to recycle the geo-thermal energy generated by some of its hotels.
The group was also the first in Spain to adopt the Spanish Ministry of Environment's voluntary commitment against climate change.
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