1 | The ice in permafrost provides an important physical structure for the frozen soil. | |
2 | It is practically all ice - permafrost - and it is thawing. | |
3 | What should people living in permafrost areas be doing to adapt to these changes? | |
4 | Once permafrost fails, there is no engineering solution to correct that situation. | |
5 | The frozen subsoil prevents roots from growing deep enough to support them. |