Reuters: In the northwest corner of the Nile Delta, Ibrahim Sharaf Al-Dein fires up his diesel-powered pump next to a murky canal only to watch it spew out a yellowish froth. For the past 15 years, antiquated irrigation systems and a government conservation drive have kept many farmers from nutrient-rich Nile waters, forcing them to tap sewage-filled canals despite their proximity to the world's longest river. "This water ruins our pumps, it breaks our machines, it's bad for our production," Sharaf Al-Dein,...