Which of the following is a negative environmental impact of using solar (photovoltaic) energy?

A. Interference with radar
and telecommunication facilities
B. Local ecosystem degradation through noise pollution
C. High consumption of freshwater resources
D. Large amounts of toxic radioactive waste

Please help

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.