The National Arbor Day Foundation has challenged many cities to earn its "Tree City USA" flag by planting and protecting more trees.

国家植树节基金会向许多城市发起挑战，要求它们通过种植和保护更多的树木来赢得那面“美国树城”的旗帜。

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The findings suggest that things like land rights, markets or government policies can influence tree planting and protection.

VOA: special.2009.09.01

In addition,the study noted tree-planting programs in countries such as China, India,Vietnam and the United States.

VOA: special.2010.04.06

Kenyan national Wangari Maathai won the 2004 Nobel Peace Prize for her work in the Green Belt Movement, an organization that engages in tree-planting activities and environment conservation.

VOA: standard.2010.02.24

The tree planting is part of a climate change project between the Welsh and Ugandan governments.

BBC: Welsh support for tree planting project in Uganda

This obligation to future generations I think was well symbolized by the tree planting that we started our meeting with.

WHITEHOUSE: The White House

By July, 30 apple, pear, cherry and plum trees were planted with help from professional arborists at the Fruit Tree Planting Foundation.

FORBES: Building Self-Sufficiency, One Tree at a Time