The editorial of Thermal Engineering of this 
                issue continues the discussion on scientific research needs in 
                vital areas in which thermal engineering has important participation. 
                The main goal is to motivate the readers, within their specialties, 
                to identify possible subjects for their future research.
              Our modern life would not be possible without electricity and the fuels used in transportation and equipment 
			that bring the so appreciated comfort to the sociedy. Energy is crucial for the development and progress of nations to the point where the level of development
			 of a country is estimated qualitatively by its energy consumption. In these contexts, along with the threat of lack of fossil fuel for the future and the
			 worldwide debate about environemntal impacts, humanity is presented the hard question about how to generate clean energy in a sustainable way facing the estimation
			 that by 2050 the demand of energy will double the demand of the beginning of the century. Oil is the most used fuel nowadays. Its excessive use, however, can birng 
			consequences as for example, its complete depletion and the negative environmental impacts due to the gases generated by its combustion. The International Panel on
			 Climate Change (IPCC) established the goal of stabilizing the level of carbon dioxide concentration below 500 ppm and to limit the increase of the global temperature
			 to 2 degrees Celsius 
			above the pre-industial levels. Taking into consideration the increase need of energy and the relevany of environamental impact matters, renewable energy has been 
			considered an attractive option. It replaces fossil fuels and the tehcnology used for its generation has been substantilly improved in years. Among the most viable 
			sources of renewable energy (solar, wind, thermal, nuclear), bionergy is the one that has the possibility to use the big spetrum of organic substacts (including toxic
			 waste) while at the same time fixes the carbon. Algae is one of those examples. A large range of biofuels as for example, biogas, biohydrogen, biomehtane, biodiesel,
			 bioethanol and biocoal, can be obtained from algae biomass..
              The mission of Thermal Engineering is to document 
                the scientific progress in areas related to thermal engineering 
                (e.g., energy, oil and renewable fuels). We are confident that 
                we will continue to receive articles’ submissions that contribute 
                to the progress of science.
              Lauber Martins, Ph.D
                 Editor