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Ships that emit less would pay less or receive credits, while higher emitters would contribute to a dedicated maritime fund that supports cleaner fuels and assists developing countries most affected by climate change.

Last week, India's Supreme Court relaxed the blanket ban, allowing people to use so-called green crackers, which its makers say emit 20-30% less pollutants than traditional ones and generate minimal ash.

The device detects communication between the drone and its pilot, then breaks that connection, explains Mr Hermansen, by emitting a powerful radio signal on the same frequency.

The probe stays dark when intact, but once an enzyme breaks the sugar's backbone, it emits light.

The Supreme Court relaxed this month a blanket ban on fireworks over Diwali to allow the use of the less-polluting "green firecrackers" -- designed to emit fewer particulates.