sentences:  While growth may continue, the rewards of this growth may be opposed by the harm from the pollution unless environmental protection is increased.A 2013 study published in the Proceedings of the National Academy of Sciences found that severe pollution during the 1990s cut five and a half (5.5) years from the average life expectancy of people living in northern China, where toxic air has led to increased rates of stroke, heart disease and cancer.A 2015 study from the non-profit organization Berkeley Earth estimated that 1.6 million people in China die each year from heart, lung and stroke problems because of polluted air.