Forestle is a Germany based search engine, which uses Google Custom Search Engine program. On their homepage they say, “Save 0.1 yd² of rainforest with each search you do at Forestle. So far we have already saved 25,024.6 yd² of rainforest!” Now when you do a search, the result shows a “Forbidden” message from Google.
More info: Forestle
Source:→ Google Blogoscoped