At D+C/E+Z, we are proud of our international network of authors. It is particularly important to us to be a platform for voices from the global south. Some authors contribute on a regular basis, others don't. Here you can find information about the people behind the contributions.

Helmut Lang

contributed to D+C/E+Z in spring 2020. He works at the GIZ Competence Centre Water, Waste Water and Solid Waste.  

All articles of Helmut Lang

International cooperation

Averting “Day Zero”

How to improve urban water supply in sub-Saharan Africa

Our Contributors


The UN Sustainable Development Goals aim to transform economies in an environmentally sound manner, leaving no one behind.