Acid attacks happen around the world, but they are most prevalent in South Asia.

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The system with a nitride semiconductor and a metal catalyst generates mainly formic acid from CO2 and water with light at a world's top efficiency of 0.2%.

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Moreover, Biden continued, women are subject to acid attacks, so-called honour killings and other horrors in many parts of the world, and they look to the United States as an example of leadership and resolve when it comes to addressing violence against women.

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