Still related to the big theme of reinforcement the SDG’s at the previous conference, we try to invite academics and researchers in the world to participate in the 3^rd Borobudur International Symposium 2021 (3^rd BIS 2021). As we know, The COVID-19 pandemic and its impact on all 17 SDGs have demonstrated that what began as a health catastrophe swiftly transformed into a human and socioeconomic crisis. In September 2019, the UN Secretary-General urged all sectors of society to mobilize for a decade of action on three fronts: global action to ensure increased leadership, increased resources, and smarter solutions for the Sustainable Development Goals; local action to embed the necessary transitions into governments’ policies, budgets, institutions, and regulatory frameworks; and international action to ensure greater leadership, increased resources, and smarter solutions for the Sustainable Development Goals. Especially in 3^rd BIS 2021, we brought up “Decade of Action towards Environmental Issues: Advancing the Innovation to Recover our Planet” as main theme. The conference will be held on Wednesday, December 15, 2021 in Magelang, Central Java, Indonesia.