Cintia and Kevin (C), Zoltan Berki Sr's step-children, play on their phones at Berki Sr's home in Ozd, Hungary, December 19, 2020. REUTERS/Marton Monus

Milan Berki, 4, is held by his mother Renata Horvat, as he is examined by a doctor in Ozd, Hungary, January 19, 2021. REUTERS/Marton Monus

Fog rolls over Dedestapolcsany, Hungary, January 5, 2020. REUTERS/Marton Monus

Relatives and friends attend the baptism of Manasse Berki in Ozd, Hungary, October 10, 2020. REUTERS/Marton Monus

A window looks out from the remains of an abandoned steel factory in Ozd, Hungary, October 19, 2020. REUTERS/Marton Monus

Renata Horvat serves food to her children during the afterparty for her son Manasse Berki's baptism in Sajonemeti, Hungary, October 10, 2020. REUTERS/Marton Monus

Bela Varga, 53, smokes a cigarette in front of his home in Ozd, Hungary, December 6, 2020. REUTERS/Marton Monus

Zoltan Berki Sr, 55, and Bela Varga, 53, search for coal in the waste dump off an old abandoned mine in Farkaslyuk, Hungary, December 19, 2020. To Zoltan Berki Sr. pollution means chest pain and coughs, but cold is a more imminent danger. "We'll dig down here, one shovels, the other picks, we collect what we find and take it home to burn," Berki said. "They heat up nicely, and we can't afford to buy anything." REUTERS/Marton Monus

A man stands inside a steel factory in Ozd, Hungary, October 19, 2020. REUTERS/Marton Monus

Smoke rises from chimneys in Borsodnadasd, Hungary, December 6, 2020. REUTERS/Marton Monus

A dog sits on top a table in the yard of a house in Ozd, Hungary, December 6, 2020. REUTERS/Marton Monus

Renata Horvat and her two-year-old daughter Annabella Berki wait to be seen at the doctor's office in Ozd, Hungary, January 12, 2021. REUTERS/Marton Monus

Bela Varga, 53, searches for coal in the waste dump off an old abandoned mine in Farkaslyuk, Hungary, December 19, 2020. REUTERS/Marton Monus

Zoltan Berki Sr, 55, looks for firewood in Ozd, Hungary, December 19, 2020. To Zoltan Berki Sr. pollution means chest pain and coughs, but cold is a more imminent danger. "We collect what we find and take it home to burn," Berki said. "They heat up nicely, and we can't afford to buy anything." REUTERS/Marton Monus

Dzsamila Berki, 8, daughter of Zoltan Berki and Renata Horvat, plays in the kitchen at her home in Sajonemeti, Hungary, September 13, 2020. REUTERS/Marton Monus

Bela Varga, 53, warms up by the fire at his home in Ozd, Hungary, December 6, 2020. REUTERS/Marton Monus

The remains of an abandoned steel factory stand in Ozd, Hungary, October 19, 2020. REUTERS/Marton Monus

Discarded plastic from outside is placed into a fire to create heat in Ozd, Hungary, December 6, 2020. REUTERS/Marton Monus

Houses stand in Miskolc, Hungary, January 5, 2020. REUTERS/Marton Monus

Zoltan Berki Sr, 55, and his friend Bela Varga, 53, drink wine together at Varga's home in Ozd, Hungary, December 6, 2020. REUTERS/Marton Monus

Zoltan Berki Sr, 55, and Bela Varga, 53, look for discarded plastic in Ozd, Hungary, December 6, 2020. To Zoltan Berki Sr. pollution means chest pain and coughs, but cold is a more imminent danger. "We'll dig down here, one shovels, the other picks, we collect what we find and take it home to burn," Berki said. "They heat up nicely, and we can't afford to buy anything." REUTERS/Marton Monus

Zoltan Berki Sr., 55, and his family remember his father-in-law Endre Javorszki during his funeral in Ozd, Hungary, January 12, 2021. REUTERS/Marton Monus

Zoltan Berki Sr, 55, searches for firewood in an old abandoned house in Ozd, Hungary, December 19, 2020. To Zoltan Berki Sr. pollution means chest pain and coughs, but cold is a more imminent danger. "We collect what we find and take it home to burn," Berki said. "They heat up nicely, and we can't afford to buy anything." REUTERS/Marton Monus

Bela Varga, 53, separates soil from small pieces of coal that he found in Ozd, Hungary, December 6, 2020. REUTERS/Marton Monus

Bela Varga, 53, drags firewood that he collected from trees on a sledge in Sajonemeti, Hungary, January 19, 2021. REUTERS/Marton Monus

Renata Horvat kisses her son Manasse Berki at their home in Sajonemeti, Hungary, February 7, 2021. REUTERS/Marton Monus

Zoltan Berki, 28, plays with his daughters in Sajonemeti, Hungary, September 13, 2020. Berki usually wakes up before dawn, as his five small children sleep next door, to feed the old iron furnace that stands in a wall cavity to warm up both rooms. This is the only part of his house that he can afford to heat during winter. "Firewood is expensive," Berki said one recent afternoon, as his family played around him, crammed into one small room. "Either I buy wood or food. So I go to the forest, or the junkyard, and if we find plastic or rubber we burn that. "But not during the day or the neighbours can see, and you can also smell it. We throw the rubber and the plastic bottles and such things on at night." REUTERS/Marton Monus