"The idea came to a group of schoolmates and me in 2014, but we never thought it could become a reality," says Sebastián Ieraci, 23, as he points to a multitude of photovoltaic solar panels shining on the roof of the Antonio Devoto High School in the Argentine capital.
Fomenting biogas production among agricultural producers may seem at first glance to be a distraction from the purpose of Itaipu, the giant hydroelectric power plant shared by Brazil and Paraguay, but in fact it is part of their energy business strategy.
The intense white brightness of the salt flats interrupts the arid monotony of the Puna in northwest Argentina, resembling postcards from the moon. Beneath its surface are concealed the world's largest reserves of lithium, the key mineral in the transition to clean energy, the mining of which has triggered controversy.
Central America is an impoverished region rife with gang violence and human trafficking - the third largest crime industry in the world - as a major source of migrants heading towards the United States.
"On moonless nights it was very difficult to walk around this town," says Celia Vilte, a teacher from San Francisco, a highlands village of just 54 people in the extreme northwest of Argentina whose centre is not a town square but 40 solar panels, which provide one hundred percent of its electricity.
"Biogas is the best energy, it has no contraindications," and if you combine it with solar it becomes "the best energy business," at least in Brazil, says Anélio Thomazzoni.
The state of Santa Catarina in southern Brazil is the largest national producer and exporter of pork and this year it also leads in exports of chicken, of which it is the second-biggest producer in the country.
Romário Schaefer is fattening up 3,300 pigs that he receives when they weigh around 22 kg and returns when they reach 130 to 160 kg - a huge increase in meat and profits for their owner, a local meat-processing plant in this city in Brazil.
Reyna Díaz cooks beans, chicken, pork and desserts in her solar cooker, which she sets up in the open courtyard of her home in a poor neighborhood on the outskirts of this town in southwestern Mexico.
"This is the best thing ever invented for the poor," says Emanuel del Monte, pointing to a tank covered in black tarps protruding from the roof of his house. It forms part of a system built mostly from waste materials, which heats water through solar energy and is improving lives in Argentina.
Children from the neighboring municipalities of Ovalle and Río Hurtado in northern Chile are harvesting rain and recycling greywater in their schools to irrigate fruit trees and vegetable gardens, in an initiative aimed at combating the shortage of water in this semi-arid region.
In the stifling heat, Diego Matom takes the bread trays out of the oven and carefully places them on wooden shelves, happy that his business has prospered since his village in northwest Guatemala began to generate its own electricity.
Social activists and local authorities in Rapa Nui or Easter Island are calling for urgent action to address rising sea temperatures, declining rainfall, and rising tides that threaten their fishing resources and their Moais, the mysterious volcanic stone monoliths.
Thirty families from a rural community more than 4,300 meters above sea level will have warm houses that will protect them from the freezing temperatures that each year cause deaths and diseases among children and older adults in this region of the southeastern Peruvian Andes.
At a brisk pace, Marciano Calamato and Mireya Noa walk along the dry, yellow soil of their farm, where they even manage to grow onions in Cuba's unique semi-arid eastern region.
The seed was planted more than 20 years ago by a group of indigenous women who began to gather to try to recover memories from their people. Today, women are also the main protagonists of La Voz Indígena (The Indigenous Voice), a unique radio station in northern Argentina that broadcasts every day in seven languages.
Dozens of trucks used to leave São Gonçalo every day, carrying the local agricultural production, mainly coconuts, to markets throughout Brazil, including the cities of Rio de Janeiro and São Paulo, more than 2,000 kilometers away.
"I've been used to hauling water since I was eight years old. Today, at 63, I still do it," says Antolín Soraire, a tall peasant farmer with a face ravaged by the sun who lives in Los Blancos, a town of a few dozen houses and wide dirt roads in the province of Salta, in northern Argentina.
Young Peruvians plan to take advantage of the knowledge acquired in Brazil's semi-arid Northeast to bring water to segments of the population who suffer from shortages, after sharing experiences in that ecoregion on the multiple uses of renewable energies in communities affected by climatic phenomena.
A long chain of people is winding its way along the highways of Chiapas, the southernmost Mexican state. It is moving fast, despite the fact that one-third of its ranks are made up of children, and it has managed to avoid the multiple obstacles that the governments of Honduras, Guatemala and now Mexico, under pressure from the United States, have thrown up in a vain effort to stop it.
They sell their houses, cars, motorcycles, household goods, clothes and ornaments - if they have any - even at derisory prices, save up a few dollars, take a bus and, in many cases, for the first time ever travel outside their country: they are the migrants who are fleeing Venezuela by the hundreds of thousands.