<prompt> Translate the following text to EnglishKutoka kwa Kizuizi kwa Jinsi Biashara ya Uzalishaji wa Mvua ya Asidi Inatoa Hewa Safi, Ulinzi wa Mazingira, Septemba 2000, ukurasa.  <response>: --From Obstacle to How Acid Rain Emissions Trading is Delivering Cleaner Air, Environmental Defense, September 2000, p. 