Read the motto. What does it mean? Words of Wisdom 'Take nothing but pictures. Leave nothing but footprints. Kill nothing but time.' Motto of the Baltimore Grotto, a caving society

I think the motto means to be careful and protect the environment that we visit.
(Я думаю девиз означает необходимость быть осторожным и защищать окружающую среду, которую мы посещаем.)