(Bloomberg) — Proposals to artificially cool the world’s polar regions — to stem the impact of global warming — are both expensive, unfeasible and potentially dangerous, according to new scientific research.

The Arctic and Antarctic are warming faster than the rest of the world, which has led some think tanks and entrepreneurs to propose large-scale technological interventions.

But those ideas — including spraying reflective particles high into the atmosphere to reflect sunlight, erecting sea “curtains” to block warm water from melting glaciers and seeding oceans with nutrients to boost the growth of carbon-absorbing algae — aren’t workable and could irreversibly damage polar regions, according to a paper published Tuesday in the journal “Frontiers in Science.”

“Some of these ideas have

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