The Kreidler Kids company can produce swing sets for $1,000. Kendra wants a new swing set for her children and will pay $1,500 for it. Kendra finds the swing set she wants and pays $1,500 for it from the Kreidler Kids company. The Kreidler Kids company has:. a. a zero social surplus
b. a consumer surplus of $500.
c. a social surplus of $1,500.
d. a producer surplus of $500.

I'm not 100% sure but i think it is service producing industries 

The answer is product modification

Combining the emissions released by fossil fuel burning and  the carbon released via land use change, we get a total of 8.7 gt. since the problem states that the oceans "take up" or sequester  2.4 gt carbon  per year, we subtract that value from 8.7 gt, leaving us with 6.3 gt of carbon. since the problem states that 3.4 gt carbon dioxide emissions end up in the atmosphere, the "missing sink" of carbon takes up 2.9 gt, a value we got by subtracting the 3.4 gt amount recorded from the 6.3 gt carbon left available after the oceans sequester the carbon dioxide. 

Answer(e) all the above are correct: