The people of Rwanda are required to take part in the national cleanup day, Umuganda, on the last Saturday of every month. (Above) Getting grass under control in Kigali, the capital city.
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Tens of thousands of people live in villages on the edge of the Ankeniheny-Zahamena Corridor rainforest in Madagascar. A government policy now bans cutting down trees to get more land for farming.
A Somali fisherman carries a fish to the market near the port in Mogadishu. One of the U.N. Sustainable Development Goals calls for the world to "conserve and sustainably use the oceans, seas and marine resources for sustainable development."
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The Philippine eagle Pithecophaga jefferyi faces extinction from mining, pollution and poaching. Photographer Tim Flach used black backgrounds to create intimate portraits for his book.
Sufiyan Khatri learned to make the dyes for the block-print textiles from his grandfather. But he likes to experiment with color and design: "Whenever I get the time, I do some innovation in our work."