Isar und englischer Garten - Wie verhindern wir die Müllberge

Es ist Sommer in der Stadt und mit einher gehen die Müllberge in den Grünanlagen. In München insb. an Isar und im Englischen Garten. Aber wie können wir das Problem lösen? Welche Ideen gibt es? Wie können wir sowohl den Frust als auch schlicht und einfach die Kosten reduzieren? (Quelle Foto: TZ)

How to fight droughts in coastal regions

Water scarcity is a serious and pressing issue even in coastal regions, and not only in California, the Middle East, and parts of Africa but also in Europe. This will be made worse by global warming. How can we harvest fresh water from sea water or from the humidity in the air or other sources. Principle technologies are there, but mostly they are very expensive or consume too much energy. We need better ideas.

How can we better use wind as a small scale energy source?

In most places some amount of wind is available all the time. What are your ideas for using it as a decentralized energy source for small scale electricity or other energy uses, e.g. for movement? Early small scale windmills were used to pump water. What are other options? The large scale wind turbines are currently the cheapest source of renewable energy. What can we do on with wind energy on the small and micro scale?