And this animation, this shows photosynthetic activity over the course of a number of years, and what you can see is that the boundaries of those deserts shift quite a lot, and that raises the question of whether we can intervene at the boundary conditions to halt, or maybe even reverse, desertification.
这个动画显示了 数年来的光合作用的活动 我们可以看到这些沙漠的范围 他们变化很大 这引发了一个问题 我们是否能干预沙漠的界线 去限制或是让沙漠化的土地回复原本的样子