Proposed "geoengineering" projects designed to reduce the impacts of global warming in polar regions would be ineffective, extremely costly and environmentally dangerous, researchers have warned.

As Antarctica and the Arctic undergo significant change amid rising temperatures, some scientists and engineers have proposed novel technological "fixes".

These have included giant floating walls to prevent warm water from reaching ice shelves, and the scattering of microbeads onto sea ice to increase its reflectivity.

But a team of international researchers, including from Australia, has published a new assessment that finds such ideas could harm ecosystems, international relations and efforts to reduce emissions.

These are some of the radical options to engineer our way out of climate catast

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