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31. An example a tipping point is the thawing of the permafrost.

32. Permafrost in the Altai Mountains in central Asia, sea ice in Alaska and glaciers in the Rocky Mountains were studied for the research.

33. In addition, the enormous heat of the explosion melted the permafrost in the Taiga and created several small lakes.

34. Perhaps this is caused by the sudden melting of subsurface permafrost.

35. It became entombed in the permafrost, where it remained until recently freed.

36. Without activists, the forests would all be gone, the air fouled, the oceans dead, the glaciers and ice-cap and permafrost melted into a brown sea.

37. Compared with conventional deterministic analysis, the probabilistic analysis method for the thaw depth design in engineering construction in permafrost area is more realistic and safer.

38. A hundred or so years ago, men were here, in winter, burning through the permafrost to dig down 15ft to what they hoped was gold-bearing rock.

39. One of the two mammoth museums. It is located in the ice-house – a cave hollowed out in the permafrost. Even in summer the temperature is subzero here.

40. Its stability is destroyed with longitudinal cracks of embankment caused by asymmetric settlement of permafrost.

41. Because of the repeated freeze-thaw cycles, many peculiar roadbed diseases, such as longitudinal cracks, thawing settlement, frost heaving and frost boiling develop in permafrost regions.

42. They are distributed in polar permafrost horizons and submarine sediments.

43. Thawing permafrost leads to releases of methane and other carbon compounds that can reach the atmosphere and increase greenhouse warming.

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44. Many underground pipelines are carried with heating tracer in permafrost region.

45. Thawing and refreezing each year, an active layer of soil lies over permafrost.

46. The harder the material under the permafrost is, the larger the chamber charge required.

47. The most ambitious is the new Svalbard Global Seed Vault, set inside the permafrost of a sandstone mountain on the Norwegian island of Spitsbergen just 700 miles from the North Pole.

48. Frost crack is the main failuve of asphalt pavement in permafrost region.

49. This was a challenge, because the permafrost is barely permanent.

50. How much methane and dioxide might be released from the rotting permafrost?

51. About half of the Golmud - Lhasa 19 section was built over permafrost.

52. That runaway effect, Scambos says, could quickly lead to a warmer climate along the Arctic perimeter and to the loss of Arctic permafrost.

53. As the permafrost melts, the land loses its capacity to absorb water.

54. The result indicates embankment berm on permafrost region should not be regarded as the main measure to improve thermal stability of embankment.

55. Rising average temperatures, for example, threaten to unlock long-frozen stores of carbon dioxide and methane -- at least 20 times as potent a greenhouse gas as CO2 -- from the region's permafrost.

56. But once the ice retreats and the permafrost thaws, heavy winds, waves, and freshwater currents can pummel the islands from all directions, making them rounder and smaller than in other environments.