Diurnal cycles of thawing and refreezing can stabilize the snowpack by promoting settlement. Some plants flower immediately after snow melting or soil thawing. Evidence suggests a gradual and prolonged release of greenhouse gases from thawing permafrost. Ice wedges enlarge with successive seasons of freezing and thawing. It was judged that increased emissions of carbon from thawing of permafrost could occur. Frozen foods need extra cooking time to allow for thawing. In high mountains rockfalls may be caused by thawing of rock masses with permafrost. Most threats are about permafrost thawing and attended effects on carbon destocking and ecosystem collapse. Lamb collected lichen samples and conducted experiments on the accumulation of snow and subsequent thawing. Winters are cool, usually with light frosts at night and thawing conditions during the day. Namgoong and Yona recognize a landmark outside and consider that the ice may be thawing. Megatron escapes the dam after thawing out. This also proved a catalyst for the thawing of relations between the two sides. Settlement talks later led to a thawing of relations between the parties. The "Thawing" or "Spring Age" spans from 1999-2003.