Kohlberg Kravis Roberts announced Friday that eight companies in its portfolio saved a total of $160 million in less than two years by implementing very simple, focused green initiatives. The companies also eliminated 345 million metric tons of carbon dioxide and 1.2 million tons of solid waste.

They achieved those results using five straightforward steps:

The specific sustainability actions the companies took are amazingly simple. US Foodservice met its goal by having its truck drivers turn off their engines once they had been idling for four minutes. Primedia (the company that prints all the free apartment finder and home finder magazines) met its goal by changing the size of its publications so they can be printed with less wasted paper.

So many companies trying to be sustainable get bogged down in complexity. It’s refreshing to see companies that have kept it simple and delivered results.