In my problem there is an average net ecosystem production rate of:
a. What percentage of 140,000 tons/yr would be offset from reforesting 45,000 acres?
b. With that what area of reforestation/afforestation would need to be offset by 10% by the same emissions?
How I solved (not sure if correct):
Since 45,000 is in acres I converted to square meters:
45,000 Acres = 182,108,539.008 m2
Then I could say for every 0.25 there would be one m2 from the above number. Therefore I multiplied.
0.25*182,108,539.008 = 45,527,134.752 kg $^o$C
So now I need to convert kg to ton:
45,527,134.752 kg = 50,185.08 tons
So now I just need to divide into 140,000 to find how much it knocks off of the total carbon emitted:
140,000 / 50,185.08 = 2.8%
Is this right? I'd imagine for 10% I'd just have to adjust the acreage to get it just right. With land area being 25,414,258,332.672 m2