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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"Thus the current real-world enthusiasm for small-reactor construction has little to do with climate-friendly environmentalism (or even the peculiar form of faux environmentalism practised by the nuclear industry and its lobbyists) and lots to do with fossil fuel mining. Another example comes from Canada, where one potential application of SMRs under consideration is providing power and heat for the extraction of hydrocarbons from oil sands."