The major factors that make today’s ‘land-use crisis’ a global issue of greatest concern is:

A. The magnitude of the problem on terms of people and areas affected, which is unprecedented in history
B. The accelerating nature of the processes involved and the increasing irreversibility of their results
C. The lack of success (for socio-economic, cultural or ecological reasons) of most agriculture technologies from temperate regions to solve land-productivity problems over large areas of the topics

D. All of the above