In 1993 this Academy held a conference in Mannheim under the title "Globale Erwärmung - Tatsache oder Behauptung?" (Global warming -- fact or fiction?). [1]
On [1] there is a list of textbooks on ecology issued by the Academy. Founder and president of the Academy was the late Prof. Dr. Dr. hc. Helmut Metzner (1925-1999), who was professor for chemical plant physiology. [1], [1].
An article by Metzner about his view on climate change can be found on the right-wing website konservativ.de [1]. He was accused of having strong connections to the Studienzentrum Weikersheim, a right-wing think-tank in Baden-Württemberg. [1]
The Academy is recognized in a consultative function [1] by the Council of Europe [1]
There are no webpages of the Academy, and there are some hints that is now defunct. It may have ceased operation with the death of Metzner.