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, permafrost is ground, including rock or (cryonic) soil, at or below the freezing point of water 0 °C (32 °F) for two or more years. Most permafrost is located in high latitudes (in and around the Arctic and Antarctic regions), but at lower latitudes alpine permafrost occurs at higher elevations. Ground ice is not always present, as may be in the case of non-porous bedrock, but it frequently occurs and it may be in amounts exceeding the potential hydraulic saturation of the ground material.
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Increased heat, drought and insect outbreaks, all linked to climate change, have increased wildfires. Declining water supplies, reduced agricultural yields, health impacts in cities due to heat, and flooding and erosion in coastal areas are additional concerns.
El sol es probablemente la fuente más importante de energía renovable disponible hoy en día. Tradicionalmente, el sol ha proporcionado energía para prácticamente todas las criaturas vivientes en la tierra, a través del proceso de fotosíntesis, en el cual las plantas absorben la radiación solar y la convierten en energía almacenada para el crecimiento y el desarrollo.
A geologic event during which sea level rises relative to the land and the shoreline moves toward higher ground, resulting in flooding.
