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The document outlines the existential risk posed by the approximately 12,000 nuclear warheads held by nine nations. It explains the physics of fission and fusion weapons and analyzes the catastrophic effects of detonations, ranging from immediate blast and radiation deaths in urban centers to global climate disruption. The guide highlights the instability of 'launch on warning' postures and the potential for 'nuclear winter' and ozone depletion, arguing that even regional conflicts would cause global famine and societal collapse.

Analysis of daily minimum temperatures in Japan from 2014 to 2023 indicates that climate change has added at least eight winter days above freezing annually across the country. In 32 of 57 analyzed Japanese cities, this increase amounted to at least two additional weeks of days above freezing per year. These 'lost winter days' impact snowfall, water supplies, crops, and winter sports.

A coalition of national and regional organizations is calling on Utah's House representatives to support S. 3853, the Radiation Exposure Compensation Reauthorization Act, noting that for the first time since 1990, affected downwinders and uranium miners lack access to compensation and cancer screenings.

The Council on Strategic Risks commends the G7 nations for their 2023 Hiroshima Vision, which prioritizes risk reduction, transparency, and the Treaty on the Non-Proliferation of Nuclear Weapons over entering a new nuclear arms race.

The document outlines the benefits and application of the Climate Bonds Initiative's certification for commercial and residential buildings in Tokyo and 16 other Japanese cities, aiming for a zero-carbon future by 2050.

The author highlights the shared history of underestimating the effects of both climate change and nuclear weapons. The text details how nuclear detonations cause immediate blast damage and long-term atmospheric disruptions, such as 'nuclear winter', which mirror the systemic risks of the climate crisis. It warns that current geopolitical instability, exacerbated by climate-driven resource scarcity, increases the risk of nuclear conflict, particularly in South Asia. The author calls for a revival of public discourse on nuclear risks to match the current momentum for climate action.

The document contends that US concerns regarding a nuclear-armed Japan are unfounded and should not prevent President Biden from declaring a no-first-use policy. It bases this on two secret government inquiries (1970 and 1995) that rejected the nuclear option, overwhelming public opposition to nuclear weapons in Japan, and the fact that a small minority of conservative officials lack the political agency to pursue such a program. The report asserts that a no-first-use declaration would not undermine the US nuclear umbrella's deterrent function for Japan.

The author contends that the existence of specific nuclear capabilities leads to the creation of contingency plans that can easily be executed, potentially bypassing political restraint. Citing the short interval between the bombings of Hiroshima and Nagasaki, the text argues that technical capabilities and the routine work of war planners shape the conditions for nuclear use more than high-level policy. The author advocates for moving away from nuclear weapon types that are perceived as 'usable' or prone to miscalculation.

The author contends that nuclear power is an unsuitable solution for global warming due to the catastrophic precedent of Chernobyl and ongoing risks. Key concerns include the lack of permanent repositories for high-level nuclear waste, the vulnerability of spent-fuel storage to terrorism, and the risk that civilian nuclear programs serve as covers for weapons proliferation. The document suggests that investing in end-use energy efficiency is seven times more cost-effective at reducing demand than nuclear power.