Food For a Healthy Planet - Answering Questions

[Belgarion]

Hey,

Ive been reviewing for my mst and looking through some past exams and msts. I was just wondering anyone who has done this subject before how to structure answers to questions? Im an analytical type of person and the way ive always been told is to  make 1 point for every mark but i dont think that will work in this case with 15 mark questions and a small space to write in.

For example :
b)   What are the implications of a warming climate for world food production? 12 marks

So would i pick a few things and explain them in detail or pick more points in brief detail?

Thanks