Scientists have predicted that the global temperature will rise in the near future and, consequently, the growing season in most countries will increase considerably. In Norway, for example, it may increase by two months, and in more northern countries the extension may be as drastic as three months. This change will allow farmers to have multiple harvest each season, and in addition to the longer growing season, climate change may also result in increased forest growth. The tree line is expected to spread further north, and forest growth will concurrently result in greater carbon dioxide absorption. Adversely, the growing season will also begin earlier, raising the risk for frost damage to crops, and it is not guaranteed that crops will survive the entire lengthened season since daylight becomes weaker towards the close. However, the benefits of a longer growing season may still outweigh the negatives.
http://www.sciencedaily.com/releases/2012/10/121010084156.htm
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