The sixth ISEBE belongs to a series of symposia (ISEBEs) and meetings (IMEBEs) that arose in Mexico between Mexican researchers and groups of non-Mexican scientists, from Europe, the USA, Brazil, etc., which met every 2 years, with the purpose of presenting the advances of their research works on environmental issues, where, in some way, biotechnology and engineering play an important role. The works of the greatest scientific interest resulting from the different meetings and symposia were published in special issues of scientific journals focused on the management and protection of the environment. These special issues, as well as the books of full articles and the abstract books of the meetings and symposia, can be found at the publications link of ABIAER (http://abiaer.com), the association on Environmental Biotechnology and Engineering, and Renewable Energies created from the first three meetings, IMEBEs.