<prompt> Translate the following text to EnglishHata hivyo, wakati tunaona uboreshaji mkubwa wa mazingira, uzalishaji wa umeme bado unashiriki asilimia 67 ya SO2, asilimia 25 ya NOx, na asilimia 37 ya zebaki ya binadamu.  <response>: However, while we are observing significant environmental improvement, power generation still contributes 67 percent of SO2, 25 percent of NOx, and 37 percent of man-made mercury. 