Mayor Troy Pickard, chief executive Garry Hunt and councillor Mike Norman joined more than 2500 people from 250 local governments to take part in the International Council for Local Environmental Initiatives event titled "Sustainable Solutions for an Urban Future".
Mr Pickard delivered a keynote presentation on urban biodiversity and water, where he spoke about the various challenges the City faces managing water resources and biodiversity.
He also highlighted the success of City projects such as hydrozoning and ecozoning in active reserves, provenance planting on verges and road projects that create biodiversity corridors.
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READ NOWHe took part in an interactive session on biodiversity and a changing climate and a panel discussion.
"The world congress provided the City with an opportunity to learn from the experiences and sustainability practices of leading local governments and industry experts and share the City's successes in an international setting," Mr Pickard said.