Solar panels are being floated on water reservoirs as an energy source (‘floatovoltaics’) to help achieve carbon-reduction goals and mitigate climate change (R. M. Almeida et al. Nature 606, 246–249; 2022). Oceans offer another option — one with a theoretical global photovoltaic capacity of around 4,000 gigawatts.
Competing Interests
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The authors declare no competing interests.