This special issue of the Polytechnica Journal deals with one of the greatest challenges for the 21st century: how to cope with an increasing demand for energy and climate change. One single answer or solution is most unlikely to be discovered and applied. A multidisciplinary approach, involving many different areas in Engineering, embracing distinct solutions and/or an integration of those solutions, is probably the path that will be applied around the world. The role of energy system modelling, simulations and experiments of new devices and equipment, all with the purpose of directly or indirectly reducing Green House Gases (GHG) emissions are addressed in this issue. The contribution of natural gas, biogas, hydrogen, and carbon capture, usage and storage (CCUS) is addressed with a particular focus on CO2 and other GHG emissions, contributing towards the Agenda 2030 of the Sustainable Development Goals (SDGs) of the United Nations. The apparently conflicting tasks of reducing emissions and at the same time increasing the energy production is discussed in the framework of selected disruptive new technologies and innovative devices.
Julio Romano Meneghini Spencer J. Sherwin
RCGI - USP, BR Imperial College, UK