Hundreds of Japanese citizens filed a historic lawsuit against their government on Thursday, claiming “unconstitutional” inaction on climate change has jeopardized their health, livelihoods, and right to a stable environment. The Tokyo District Court officially accepted the complaint, marking Japan’s first state-focused climate compensation case.
Lead lawyer Akihiro Shima said the plaintiffs are seeking damages of 1,000 yen ($6.50) each, but stressed the central goal is to hold the government accountable for failing to implement adequate climate policies. “The defendant’s climate change measures are grossly inadequate, and as a result, the plaintiffs’ rights to a peaceful life and to the enjoyment of a stable climate are being violated,” the lawsuit states.
Hundreds of people across Japan have sued the central government seeking damages for “unconstitutional” inaction on climate change, saying the country’s “grossly inadequate” response jeopardizes health and livelihoods. 👉 https://t.co/MXveSf4GfX pic.twitter.com/iLbbKHI8wg
— The Japan Times (@japantimes) December 18, 2025
Among the plaintiffs is Kiichi Akiyama, a 57-year-old construction worker, who described how extreme summer heat — Japan’s hottest on record since 1898 — has forced his team to work more slowly, causing “huge losses” to his business. He said workers often collapse in the field or suffer severe heat-related illnesses, highlighting the human cost of climate inaction. Another plaintiff, Saito, cited concerns over her six-year-old son as motivation to join the case.
Experts note that while Japan has faced climate-related lawsuits before — such as challenges against coal-fired power plants — this is the first compensation claim directly targeting the state for failing to protect its citizens from climate risks. Similar legal precedents exist internationally: South Korean youth activists won a landmark climate case, and Germany’s courts previously ruled certain climate targets unconstitutional.
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Kyoto University assistant professor Masako Ichihara said the chances of a legal victory in Japan may be slim, but the case could succeed in raising public awareness due to its relatable and urgent messaging. The plaintiffs emphasize the human and economic toll of climate inaction, hoping to pressure policymakers to adopt stronger climate measures before further damage occurs.