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. Forster/ullstein bild via Getty Images hide caption

Goats and Soda
STORIES OF LIFE IN A CHANGING WORLDEnvironment
Wednesday
Wednesday
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. Mahesh Poudyal hide caption
Thursday
A worker sorts plastic bottles at a recycling center in China. Jie Zhao/Corbis via Getty Images hide caption
Monday
Baobab trees along a dirt road called the Avenue of the Baobabs in Morondava, Madagascar. Panoramic Images/Getty Images hide caption
Thursday
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." Mohamed Abdiwahab/AFP/Getty Images hide caption
Wednesday
Saturday
Portrait of a Nile crocodile. Matthijs Kuijpers/Getty Images hide caption
Wednesday
The Permafrost Tunnel Research Facility, dug in the mid-1960s, allows scientists a three-dimensional look at frozen ground. Kate Ramsayer/NASA hide caption
Saturday
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. Tim Flach hide caption
Thursday
A woman wears a mask and filter as she walks to work during heavy pollution in Beijing, China. Kevin Frayer/Getty Images hide caption
Thursday
Ghulam Siddique, a goat herder from Pakistan's Sindh province, has been forced to increase the price of his goats to offset the rising cost of the animals' feed. Amar Guriro for NPR hide caption
Saturday
One of the stray dogs that turned blue hangs out on a street in the Taloja industrial zone in Mumbai. AFP/Getty Images hide caption
Sunday
A Himalayan griffon vulture perches in the mountains. Nepal is home to nine species of vulture, four of which are critically endangered. Mary Plage/Getty Images hide caption
Thursday
A Ugandan baboon sits in a farmer's jackfruit tree. Megan Kearns/Courtesy of Innovations for Poverty Action hide caption
Friday
Wind turbines provide energy in Egypt's Sinai Desert. Helping developing countries harness energy from the wind is one of the Green Climate Fund's goals. Anton Petrus/Getty Images hide caption