7. sınıf ingilizce 9. ünite Environment (Çevre) Test 1

Looking at the data from the last 50 years, scientists have observed a steady increase in atmospheric CO₂ levels from 320 ppm to over 410 ppm. This rise is primarily attributed to:
Which factor has been the main contributor to this increase?

A) Volcanic activity
B) Burning of fossil fuels
C) Natural carbon cycle
D) Ocean currents