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The progression of global climate change is having a significant impact on our daily lives by increasing the number and scale of natural disasters and changing the distribution areas of plants and animals. In addition, the rapid decrease in population that is expected in the future will lead to a shortage of people to support local communities, including environmental conservation, and there are concerns about the decline in local vitality. Against this backdrop, I am convinced that Nagano Prefecture, with its beautiful and rich natural environment, its unique traditions and culture, and its strong regional ties, can be a frontrunner in building a new sustainable society.
In 2017, Japan’s Ministry of the Environment, ICLEI, and Nagano Prefecture collaborated to hold Japan’s first International Conference on Local Renewable Energy in Nagano Prefecture. As a result of the conference, the Nagano Declaration by Local Government Leaders Aiming for a 100% Renewable Energy Region was issued.
In 2019, the G20 Ministerial Meeting on Energy Transformation for Sustainable Growth and the Global Environment was held in Karuizawa, a town with a rich track record of hosting international conferences. On the occasion of this meeting, we have compiled the ‘Nagano Declaration on Collaboration for the Development of a Sustainable Society’ together with ICLEI, and are calling for the support of local governments around the world. We will continue to strive for the realization of a sustainable society through partnerships with ICLEI and all other actors.
Nagano Prefecture, located in the centre of the Japanese archipelago, has an area of 13,561.56 km2 and is the fourth largest of the 47 prefectures after Hokkaido, Iwate, and Fukushima. It is one of the most mountainous prefectures in Japan, blessed with a rich natural environment, with a series of 3,000-meter-high mountains bordering eight prefectures and large rivers such as the Chikuma, Kiso, and Tenryu Rivers flowing out of the mountains.
Nagano Prefecture hosted the 1998 Winter Olympics and Paralympics, and became known for the international Nagano Snow Resort. Even today, many skiers from overseas visit Nagano to enjoy the magnificent mountain scenery and the world’s best powder snow.
Population
(As of 1 April 2026)
Area
Efforts to achieve the Sustainable Development Goals (SDGs), which aim to address economic, social, and environmental challenges in an integrated manner, are expanding both in Japan and worldwide. In March 2018, Nagano Prefecture formulated its Fourth Environmental Plan, which identifies the promotion of SDG-oriented policies as a key guiding principle. In June of the same year, the prefecture was selected as one of Japan’s “SDGs Future Cities.”
In June 2021, Nagano Prefecture also adopted the “Nagano Zero Carbon Strategy: Actions through FY2030 toward Achieving Net Zero by 2050,” setting an ambitious target of reducing net greenhouse gas emissions by 60% by FY2030 on the path toward carbon neutrality by 2050.
In November 2023, the prefecture developed a scenario outlining pathways to achieve its FY2030 target. Furthermore, in FY2025, it conducted a mid-term review of the strategy and decided to strengthen and expand its efforts to ensure progress toward its goals.
Moving forward, Nagano Prefecture will continue to promote initiatives that not only protect the environment but also leverage environmental action to help address broader economic and social challenges.
Associate Partnership is available to non-governmental organizations, universities, state and national government agencies and not-for-profit research institutions. The purpose of Associate Partnership is to facilitate dialogues between local governments and these partners, to provide knowledge transfer in line with ICLEI’s Mission and Charter, and an avenue for which partners can support ICLEI’s work and mandate.

HARNESS the power of the ICLEI Network!" Governments need to give (the sense of) direction, as Business leaders we don't make the wind, we sail the boats. So policy should set the winds in the right directions if you want the boat going fast to the right harbor."Philippe Joubert Senior Advisor, World Business Council
on Sustainable Development
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Joining ICLEI means connecting to more than 2,500 local and regional governments as well as technical experts and a diversity community of partners worldwide. ICLEI Members actively engage with their peers through conferences, workshops, webinars and online platforms and take advantage of our connections with businesses, financial institutions and other implementation partners that help strengthen innovation and resourcing.
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