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Annual ring / Environmental protection

Annual ring

The tropical rain forest on earth is fading away at the rate of 17 million hectares a year, which equals a forest the size of a football field vanishing in one minute.
Trees are the living archives and the annual rings in the trunks are the files. However, today the method we use when we try to find out the annual ring of a tree is hurting the woods, we need to make every endeavor to protect them right now! Help every tree “wear” its annual ring. As the tree grows slowly, the annual ring on its trunk is stretching accordingly to show its age. Let’s help people feel the growth vividly and care about the environment we live in, will you?


Southwest Jiaotong University

Southwest Jiaotong University
Chengdu, China

Qilei Su,
Southwest Jiaotong University

Fangyu Li,
Southwest Jiaotong University