Another example is scientist and author Diana Beresford-Kroeger, world recognized expert on how trees chemically affect the environment, who brings together the fields of ethnobotany, horticulture, ecology, and spirituality in relation to the current ecological crisis and stewardship of the natural world. She says, "... the world, the gift of this world is fantastic and phenomenal. The molecular working of the world is extraordinary, the mathematics of the world is extraordinary... sacred and science go together."[50][51]