The author's attitude towards the current situation in the exploitation of natural resources is______.

A．we plant more trees
B．we be taught environmental science, as well as the science of plants
C．environmental education be directed toward everyone
D．we return to nature

A．the interdependence of water, soil, and living things
B．the importance of the proper land use
C．the harmfulness of soil destruction and river floods
D．the extraordinary rapid growth of population