Our eyelids are screens that protect the eyeball from the many small particles that settle on them.

Screenshot PM2.5 reading of Shenyang on November 8 from Aqistudy.cn, an air quality monitor website.

The program, which will cost 1.7 trillion yuan (about 278 billion US dollars), set an ambitious target to cut PM2.5, fine particles most detrimental to human lungs, by 25 percent by 2017 in Beijing and its neighboring areas.

Shenyang's air registered at PM2.5 index with the maximum figure 1326 μg m3 on November 8.

According to WHO's air quality guidelines, the air is considered hazardous when PM 2.5 is present in the air at 301 500 μg m3 level.

Sensible risk management today dictates that atmospheric carbon should be stabilized at 350 parts per million of CO2 equivalent, not the current pathway of 450 500ppm CO2e. This requires emission reductions of 45 50 in industrialized countries by 2020, and almost complete de carbonization by 2050, not the levels of 15 25 by 2020 and 60 80 by 2050 that are now on the table.

Executive Summary

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