Appropriate Technologies, Hamzah Style

THE September sun is scorching. The dry season is reaching its peak. But the trees in the plantation and yard of Ida Bagus Putu Suwatha, a resident of Sigerongan village, Lingsar district, West Lombok regency, in West Nusa Tenggara (NTB) province are verdant green, flourishing and vigorous.

It turns out that an object is stuck to every tree in the plantation: a used plastic mineral water bottle, painted silver, has a tube in the lower side that

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