Here are images of the four similar semi-postal (charity) stamps in a set depicting helping hands supporting women, printed by lithography, and issued for use in Netherlands Antilles on July 4, 1967, Scott Nos. B77-B80.
Iran is a country with vast stretches of land lacking forests. 'Every year, just before the Iranian New Year, millions of Iranians plant trees to mark the tree-planting week and hail the coming of spring.' (Wiki) 1992
The Intergovernmental Authority on Drought and Development (IGADD), was a multinational body founded in 1986 by Djibouti, Ethiopia, Somalia, Sudan, Uganda and Kenya, with a focus on development and environmental control. Eritrea joined the organization in 1993. In 1996 it was reorganized as the IGAD.
The ecology of the tiny island nation of Nauru in the west Pacific suffered from the exploitation of its phosphate deposits. Planting trees may help restore the landscape of the formerly beautiful island.