Uranium is currently fissioned in nuclear reactors to produce electrical energy. Thorium adherents rightfully say that uranium-fueled reactors pose undesirable financial, security, weapons proliferation, emissions, decommissioning, waste management, environmental, and health risks.
However, replacing uranium fuel with thorium would not fix these problems.
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https://cleangreensask.ca/wp-content/uploads/2021/09/Thorium-hope-or-hype.pdf