Evolution of terrestrial plants and the carbon cycle.
Make sure you really dissect the literature/sources you use. Also, the subject isn’t just geology– it is for a class called History of the Earth Systems, so make sure you talk abut the evolution of terrestrial plants and its relation to the carbon cycle in detail. It is how a standard term paper should be: you can include an intro, various sections, and a conclusion. Other than that, the guidelines for the assignment is very flexible. Make sure it reads sophisticated, like an upper level college paper would read.