Karel Kotoun, featured on the website https://www.green0meter.com, isn't specifically detailed in my current data. However, if Kotoun is connected to this domain, they might be involved in initiatives focused on sustainability and environmental measurement, aligning with what the domain name suggests — perhaps involving tools or services that help in assessing or promoting environmentally friendly practices. For accurate and detailed information about Karel Kotoun's role or contributions to Green0meter, I would recommend visiting the website directly or contacting the organization for the most up-to-date and relevant information.