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Another customer, teacher Rob Szarka, left a review on Amazon: "It's too early to report on whether wearing it in class has improved my students' understanding of chapter 9 of Mankiw's Principles of Economics, but I believe the bright red color I ordered did help them stay awake at 8 a.m. today."

Any proposal to restrict the use of plastics would trigger a storm of protests from the powerful business groups who would object to anything that could be seen to add to their costs.

Apart from coal consumption, dust from construction sites is also a major source of air pollution, said Qin Dadi, an engineer of the Chinese Academy of Geological Sciences. "Many studies, from both Chinese and international researchers, have pointed to dust from construction sites as a major source of air pollution."

Antti Kurvinen, a member of the Parliament of Finland, said he found the presentation "really interesting".