Salvadoran villager Maria Luz Rodriguez placed the cheese on top of the lasagna she was cooking outdoors, put the pan in her solar oven and glanced at the midday sun to be sure there was enough energy for cooking.
The forest is the main resource in the Chaco, a vast plain shared by Argentina, Bolivia and Paraguay. And how to use it sustainably is the most difficult question. Two recently inaugurated power plants fired by forest biomass provide a possible answer, although they are not free of controversy.
"We are no longer familiar with the Xingú River," whose waters govern "our way of life, our income, our food and our navigation," lamented Bel Juruna, a young indigenous leader from Brazil´s Amazon rainforest.
Ermelinda Lobos's life has improved substantially since she and the rest of the people in her small village, hidden in the mountains of northeastern El Salvador, worked hard to build a mini hydroelectric plant and become self-sufficient in energy.
Mayan anthropologist Ezer May fears that the tourism development and real estate construction boom that will be unleashed by the Mayan Train, the main infrastructure project of Mexican President Andrés Manuel López Obrador, will disrupt his community.
"The harvested water has helped us at critical times and the fog nets have also brought us visibility. Today we produce beer here and many tourists come," says Daniel Rojas, president of the Peña Blanca Agricultural Community in Chile.
A communally built small dam at almost 3,500 meters above sea level supplies water to small-scale farmer Cristina Azpur and her two young daughters in Peru's Andes highlands, where they face water shortages exacerbated by climate change.
It's eight o'clock in the morning and Pascuala Ninantay is carrying two large containers of water in her wheelbarrow to prepare with neighbouring women farmers 200 litres of organic fertiliser, which will then be distributed to fertilise their crops, in this town in the Andes highlands of Peru.
Rosa Manzano carefully arranges pieces of wood in a big mud igloo that, seven days after it is full, will produce charcoal of high caloric content.
"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.