SYDNEY, Australia — Construction firms from Japan and Australia have started work on a 182-meter-high skyscraper in central Sydney in what is planned to be the world’s tallest hybrid-timber building using an eco-friendly wood product. Tokyo-based Obayashi and Sydney-based Built plan to complete construction on the 39-story Atlassian Central in 2026. …The companies aim to cut carbon dioxide emissions during construction by 50% or more compared to a conventional building project and operate the tower entirely with renewable energy, they said. The seventh floor upwards will feature a hybrid-timber structure that consists of a combination of steel frames and cross-laminated timber. Obayashi has been emphasizing in its home market the construction of low-emission wood buildings and increasing the use of the eco-friendly lumber product. …The firm “aims to achieve a sustainable society by expanding and promoting the use of recyclable resources such as timber and wooden materials.”