I believe the answer is C I don't know why but it seems right I am a professor in college and you should know this if your in high school its in the high school curriculum to know all of the facts. so yeah listen to me its C

which of the following is NOT a problem caused by human population growth?
a. not enough natural recourses to meet needs
b. not enough clean water
c. not enough cleared land
d. not enough carbon dioxide

d. not enough carbon dioxide.
Not enough carbon dioxide isn't a problem with human population growth because we need Oxygen to breath and not carbon dioxide.
Answer:
I would type it up, but I decided to insert a picture.
Explanation:
Pros:
more food is produced in mass amounts
is cheaper than non gmo food
easier and more efficient access
cons:
not as healthy/may contain chemicals
is more expensive
hard to access sometimes because is usually at fresh or local markets
Carbon
Hydrogen
Nitrogen
Oxygen
Phosphorus