Cemex SAB de CV was founded in 1906. It is a cement manufacturer with operations in North America, Europe, South America, Central America, the Caribbean, Africa, the Middle East, Australia and Asia. It is a holding company of entities which main activities are oriented to the construction industry, through the production, marketing, distribution and sale of cement, ready-mix concrete, aggregates and other construction materials. Cement is a binding agent, which, when mixed with sand, stone or other aggregates and water, produces either ready-mix concrete or mortar. It manufactures cement through a closely controlled chemical process, which begins with the mining and crushing of limestone and clay, and, in some instances, other raw materials. The clay and limestone are then pre-homogenized, a process which consists of combining different types of clay and limestone. It owns the registered trademarks for its brands in Mexico, such as 'Tolteca,' 'Monterrey,' 'Maya,' 'Anahuac,' 'Campana,' 'Gallo,' and 'Centenario.' The Company's competitors includes Lafarge Tarmac, Heidelberg, Aggregate Industries ,Hope Construction Materials , Dyckerhoff, Holcim, Schwenk Lafarge, Italcementi and Vicat. The Company's operations are subject to laws and regulations relating to the protection of the environment in the various jurisdictions in which it operates, such as regulations regarding the release of cement dust into the air or emissions of greenhouse gases.