Preface to Special Topic: Selected Papers From the Tenth International Congress of the Mexican Society of Hydrogen-Renewable Energies, TOLUCA, MEXICO, 2010.

The article focuses on the renewable technologies, which were discussed in the three papers presented during the 10th International Congress of the Mexican Society of Hydrogen "Renewable Energies," held from September 27 to October 1, 2010 in Toluca, Mexico. It says that a large solar-derived energy source is represented by biomass. It adds that large amounts of carbon dioxide is produced by the industrial conversion of methane into hydrogen.