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The ICJ has joined other leading human rights NGOs in setting out a range of specific measures to increase the effectiveness of UN Special Procedures – independent experts appointed by the Human Rights Council to address particular themes or countries.

In his Trattato della Pittura (Treatise on Painting), Leonardo da Vinci was the first person to mention that trees form rings annually and that their thickness is determined by the conditions under which they grew. S., Alexander Catlin Twining (1801–1884) suggested in 1833 that patterns among tree rings could be used to synchronize the dendrochronologies of various trees and thereby to reconstruct past climates across entire regions.You may notice that some of our content still refers to English Heritage.We are in the process of rebranding, but in the meantime please be assured that all our content and guidance is still current.New growth in trees occurs in a layer of cells near the bark.A tree's growth rate changes in a predictable pattern throughout the year in response to seasonal climate changes, resulting in visible growth rings.

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Historic England, and its predecessor English Heritage, have produced technical advice on scientific dating techniques.

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