**Preface**

In previous decades, industries have mostly developed at the cost of environmental neglect, resulting in numerous environmental issues and, ultimately, a distressing global crisis. Therefore, in the 21st century, governments and world organizations are attempting to legislate sustainable development laws for industrial advances. "Green chemistry", as a rather novel field of chemistry and chemical engineering, is one of the key routes to assist researchers in sustainable development. Among the most valuable assets of green chemistry, "green solvents" are the primary candidates to replace the industry workhorses, i.e., conventional harmful solvents. In recent decades, green solvents have been studied intensively by scientists and researchers, and the number of published articles has been increasing exponentially. The most important green solvents, such as supercritical fluids, ionic liquids, and deep eutectic solvents, have been investigated in various fields and for numerous applications; yet, much remains unknown, and there is great room for further investigations into this class of solvents. This Special Issue aims to cover the most recent advances in the interdisciplinary area of green solvents.

> **Reza Haghbakhsh, Sona Raeissi, and Rita Craveiro** *Editors*
