“The babies sat up, frightened. Another hot blast hit them, but kept on, and when the edges of the blanket blew up, Lupe reached for Esperanza, whining. Irene stood up and pointed to the east. The sky was darkening with amber clouds and several brown tumbleweeds bounced towards them. A roil of brown loomed over the mountains” How dose this contribute to the tone of the book Esperanza Rising.