Question

Which of the following is not a manmade cause of global warming?
a. burning fossil fuels
b. deforestation
c. respiration
d. population growth user: the early arrival of spring in new hampshire has no effect on wildlife. please select the best answer from the choices provided t f

Answer 1

Respiration is not a man-made cause of global warming.

Answer 2

Respiration is not a manmade cause of global warming. Correct answer: C  

Global warming is caused by emitting greenhouse gasses in the atmosphere. Carbon dioxide (CO2), methane, nitrous oxide, water vapor and ozone are among the most prevalent.  CO2, largely result from respiration, and respiration is a natural process. However, CO2 also result from burning of fossil fuels which is a manmade cause.