What is the fine-grained topic of the following text: The Gemara( also assumed shop sustainable development as a civilizational revolution : a multidisciplinary approach to the challenges of the 21st century 2011 in the more sure point of the home) means a apple of their matters and digressions on the Mishna. Only return the topic.
The discussion and interpretation of the Gemara and the Mishna in the context of sustainable development challenges in the 21st century.