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	<authority>
	    <topic authority="Vocabulario General de la Biblioteca Nacional de Maestros">Conservación del medio ambiente</topic>
	</authority>

        <related type="narrower">
        <topic>Especies en peligro de extinción</topic>
    </related>
        <related type="narrower">
        <topic>Ingeniería sanitaria y ambiental</topic>
    </related>
        <related type="narrower">
        <topic>Patrimonio natural</topic>
    </related>
        <related type="narrower">
        <topic>Zonas protegidas</topic>
    </related>
        <related type="narrower">
        <topic>Zoológicos</topic>
    </related>
    
            <related type="broader">
        <topic>Medio ambiente</topic>
    </related>
    
        <related type="other">
        <topic>Desarrollo sostenible</topic>
    </related>
    
        <variant type="other">
        <topic>Conservacion de bosques</topic>
    </variant>
        <variant type="other">
        <topic>Conservación de la naturaleza</topic>
    </variant>
        <variant type="other">
        <topic>Conservación del agua</topic>
    </variant>
        <variant type="other">
        <topic>Conservación del suelo</topic>
    </variant>
        <variant type="other">
        <topic>Protección ambiental</topic>
    </variant>
        <variant type="other">
        <topic>Protección del medio ambiente</topic>
    </variant>
    
    	<note type='source' xml:lang="es">UNESCO</note>
    
</mads>