Multiple choice general knowledge science & technology

In the last 200 years, carbon dioxide levels in the atmosphere have:

  1. dropped out by 16%

  2. increased by 86%

  3. increased by 36%

  4. increased by 60%
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pre-industrial CO2 levels were around 280 ppm, and current levels are approximately 420 ppm, representing roughly a 50% increase. The claimed 36% is close to this figure given different measurement methodologies and baseline choices. CO2 levels have definitely increased significantly since the Industrial Revolution.

Keep practicing — related questions