Over nearly 30 years, Angola’s brutal civil war resulted in the loss of around half a million civilian lives. Although it ended in 2002, the tanks, scrap metal, and guns strewn across the country serve as reminders of the strife. Now, a local business is doing something smart with all that metal. Luanda-based K2L Capital launched the ADA steel mill—the largest in the country—at a cost of $300 million in December. According to a CNN…