Services for the production of water, services for the treatment of water, of drinking water, water purification services, sewerage services, services related to the purification, clarification of waste water, services for the management of drinking water plants, for the purification and clarification of municipal or industrial waste water and information in these fields, services related to the purification of sheets of water, services related to prospecting, exploiting and managing ground water quality and services for the assessment and management of water resources; services for the transformation of raw materials, services for the production of electric energy, thermal energy, air conditioning, services for the management of air conditioning and heating plants, services for the treatment of petroleum, of electricity, services for upgrading petroliferous materials, refining services; services for treating air, for deodorising air, services for purifying air, for regenerating air, for cooling air; services for the treatment of waste, of refuse, of industrial greases (transformation), of sludge and ashes from sewerage plants, both municipal and industrial, and information in this field, services for recycling refuse and waste, services for preparing compost from refuse and waste, services for preventing pollution, ground cleansing services and services for the rehabilitation of deteriorated sites, services for the rehabilitation of waste and drinking water networks, services related to upgrading industrial, household, hospital and special waste