Answer:
2
Explanation:
The USA is bordered by Canada and Mexico.
Answer:
a is 1.
b. is 2.
and c is 3.
BTW, this is not a guess.
Only the private sector can create both positive and negative externalities.
Answer:
We can conclude that the co2 concentration will go up in 2015 and in late 2016 it will start to fall.
Explanation:
By looking at graphed points before 2015 we can see that the co2 concentrations rise even higher about every two years, but then start to go down.
