Helpful hints about our website?

Would you like to tell us how we can improve our website? Have you noticed an error somewhere? Well, we look forward to hearing about it from you! Please direct any questions concerning environmental topics to our help desk (Bürgerservice) via "Ask UBA". Thank you very much!

We have copied the address of your last visited page. If your hint refers to another page, please copy the address here.
Is it a broken link or has a gremlin crept in? We would appreciate it if you could tell us so that we may quickly correct the error.
Perhaps we do not have what you are looking for, or it is very hard to find. Please tell us what you were looking for and where.
Does the category of something you found on the website seem illogical? Are you experiencing problems with your search? Where can we improve so you can get your results faster?
What does one plus four equal?
Solve this maths problem and enter the solution with digits. E.g. for "What does two plus four equal?" enter "6".