Lakshmi Mittal, CEO of ArcelorMittal, is seen during the 50th World Economic Forum (WEF) annual meeting in Davos, Switzerland, January 22, 2020. REUTERS/Denis Balibouse

The Ilva steel plant is seen in Taranto, Italy, November 11, 2019. REUTERS/Ciro De Luca

Protesters calling for the closure of the Ilva steel plant hold a demonstration outside the plant in Taranto, Italy, November 11, 2019. REUTERS/Ciro De Luca

A demonstrator prepares a banner to protest against the Ilva steel plant, in Taranto, Italy, November 11, 2019. REUTERS/Ciro De Luca

A banner reading "Taranto won't die for steel" is pictured on a bridge overlooking Aragonese Castle in Taranto, Italy, November 11, 2019. REUTERS/Ciro De Luca

The Ilva steel plant is seen in Taranto, Italy, November 11, 2019. REUTERS/Ciro De Luca

The Ilva steel plant is seen in Taranto, Italy, November 11, 2019. REUTERS/Ciro De Luca

Steam comes out of the chimneys of the Ilva steel plant in Taranto, Italy, November 11, 2019. REUTERS/Ciro De Luca

Steam comes out of the chimneys of the Ilva steel plant in Taranto, Italy, November 11, 2019. REUTERS/Ciro De Luca

Carla Luccarelli, mother of Giorgio who died at the age of 15 from soft tissue sarcoma, poses during interview in the "Giorgio Forever" association in Taranto, Italy, November 10, 2019. REUTERS/Ciro De Luca

Angelo Di Ponzio, father of a 15-year-old boy who died from a soft tissue sarcoma in January, holds a t-shirt with a portrait of his son Giorgio in Taranto, Italy, November 10, 2019 Reuters/Ciro De Luca

Tombs in the Tamburi district with Ilva steel plant's chimney in the background are seen in Taranto, Italy, November 10, 2019 Reuters/Ciro De Luca TPX IMAGES OF THE DAY

Carla Luccarelli, mother of a 15-year-old boy who died from a soft tissue sarcoma in January, poses next to a canvas made with dust found in the streets of Taranto, Italy, November 10, 2019. The banner reads: "Mother against dioxins". Reuters/Ciro De Luca

Carla Luccarelli and Angelo Di Ponzio, parents of a 15-year-old boy who died from a soft tissue sarcoma in January, speak during an interview in Taranto, Italy, November 10, 2019. Reuters/Ciro De Luca

Carla Luccarelli and Angelo Di Ponzio, parents of a 15-year-old boy who died from a soft tissue sarcoma in January, speak during an interview, with a banner showing a portrait of their son in the background, in Taranto, Italy, November 10, 2019 Reuters/Ciro De Luca

Carla Luccarelli and Angelo Di Ponzio, parents of a 15-year-old boy who died from a soft tissue sarcoma in January, speak during an interview in Taranto, Italy, November 10, 2019 Reuters/Ciro De Luca

Steam comes out of the chimneys of Ilva steel plant in Taranto, Italy, November 9, 2019. Picture taken November 9, 2019. REUTERS/Ciro De Luca

Steam comes out of the chimneys of Ilva steel plant in Taranto, Italy, November 9, 2019. Picture taken November 9, 2019. REUTERS/Ciro De Luca

Steam comes out of the chimneys of Ilva steel plant in Taranto, Italy, November 9, 2019. Picture taken November 9, 2019. REUTERS/Ciro De Luca

The Ilva steel plant is seen after ArcelorMittal said it was withdrawing from a deal to buy it over a legal row with the government, in Taranto, Italy, November 9, 2019. REUTERS/Ciro De Luca

The Ilva steel plant is seen after ArcelorMittal said it was withdrawing from a deal to buy it over a legal row with the government, in Taranto, Italy, November 9, 2019. REUTERS/Ciro De Luca

The Ilva steel plant is seen after ArcelorMittal said it was withdrawing from a deal to buy it over a legal row with the government, in Taranto, Italy, November 9, 2019. REUTERS/Ciro De Luca

Ilva steel plant workers, whose jobs are at risk after ArcelorMittal said it was withdrawing from a deal to buy the struggling firm, get on a bus outside the plant in Taranto, Italy, November 9, 2019

Ilva steel plant workers, whose jobs are at risk after ArcelorMittal said it was withdrawing from a deal to buy the struggling firm, are seen outside the plant in Taranto, Italy, November 9, 2019

Ilva steel plant workers, whose jobs are at risk after ArcelorMittal said it was withdrawing from a deal to buy the struggling firm, are seen outside the plant in Taranto, Italy, November 9, 2019

Ilva steel plant workers, whose jobs are at risk after ArcelorMittal said it was withdrawing from a deal to buy the struggling firm, are seen outside the plant in Taranto, Italy, November 9, 2019

An Ilva steel plant worker walks out of the plant after ArcelorMittal said it was withdrawing from a deal to buy it over a legal row with the government, in Taranto, Italy, November 9, 2019.

Ilva steel plant workers, whose jobs are at risk after ArcelorMittal said it was withdrawing from a deal to buy the struggling firm, are seen outside the plant in Taranto, Italy, November 9, 2019

The Ilva steel plant is seen after ArcelorMittal said it was withdrawing from a deal to buy it over a legal row with the government, in Taranto, Italy, November 9, 2019. REUTERS/Ciro De Luca

The Ilva steel plant is seen after ArcelorMittal said it was withdrawing from a deal to buy it over a legal row with the government, in Taranto, Italy, November 9, 2019. REUTERS/Ciro De Luca

The Ilva steel plant is seen after ArcelorMittal said it was withdrawing from a deal to buy it over a legal row with the government, in Taranto, Italy, November 9, 2019. REUTERS/Ciro De Luca

The Ilva steel plant is seen after ArcelorMittal said it was withdrawing from a deal to buy it over a legal row with the government, in Taranto, Italy, November 9, 2019. REUTERS/Ciro De Luca

The Ilva steel plant is seen after ArcelorMittal said it was withdrawing from a deal to buy it over a legal row with the government, in Taranto, Italy, November 9, 2019. REUTERS/Ciro De Luca

Former Ilva steel plant worker Egidio Murciano is pictured at home in front of a view of the plant, after ArcelorMittal said it was withdrawing from a deal to buy it over a legal row with the government, in Taranto, Italy, November 9, 2019. REUTERS/Ciro De Luca

Former Ilva steel plant worker Egidio Murciano is pictured at home in front of a view of the plant, after ArcelorMittal said it was withdrawing from a deal to buy it over a legal row with the government, in Taranto, Italy, November 9, 2019. REUTERS/Ciro De Luca

Former Ilva steel plant worker Egidio Murciano is pictured at home in front of a view of the plant, after ArcelorMittal said it was withdrawing from a deal to buy it over a legal row with the government, in Taranto, Italy, November 9, 2019. REUTERS/Ciro De Luca

The Ilva steel plant is seen after ArcelorMittal said it was withdrawing from a deal to buy it over a legal row with the government, in Taranto, Italy, November 9, 2019. REUTERS/Ciro De Luca

The Ilva steel plant is seen after ArcelorMittal said it was withdrawing from a deal to buy it over a legal row with the government, in Taranto, Italy, November 9, 2019. REUTERS/Ciro De Luca

The Ilva steel plant, which ArcelorMittal is threatening to abandon over a legal row with the government, is seen in Taranto, Italy, November 9, 2019. REUTERS/Ciro De Luca

The Ilva steel plant, which ArcelorMittal is threatening to abandon over a legal row with the government, is seen in Taranto, Italy, November 9, 2019. REUTERS/Ciro De Luca

Italian Prime Minister Giuseppe Conte speaks to a protester as he visits the Ilva steel plant, which ArcelorMittal is threatening to abandon over a legal row with the government, in Taranto, Italy, November 8, 2019. REUTERS/Ciro De Luca

Italian Prime Minister Giuseppe Conte visits the Ilva steel plant, which ArcelorMittal is threatening to abandon over a legal row with the government, in Taranto, Italy, November 8, 2019. REUTERS/Ciro De Luca

Italian Prime Minister Giuseppe Conte visits the Ilva steel plant, which ArcelorMittal is threatening to abandon over a legal row with the government, in Taranto, Italy, November 8, 2019. REUTERS/Ciro De Luca

Italian Prime Minister Giuseppe Conte speaks to protesters as he visits the Ilva steel plant, which ArcelorMittal is threatening to abandon over a legal row with the government, in Taranto, Italy, November 8, 2019. REUTERS/Ciro De Luca

Italian Prime Minister Giuseppe Conte speaks to a protester as he visits the Ilva steel plant, which ArcelorMittal is threatening to abandon over a legal row with the government, in Taranto, Italy, November 8, 2019. REUTERS/Ciro De Luca

Italian Prime Minister Giuseppe Conte speaks to protesters as he visits the Ilva steel plant, which ArcelorMittal is threatening to abandon over a legal row with the government, in Taranto, Italy, November 8, 2019. REUTERS/Ciro De Luca

Italian Prime Minister Giuseppe Conte visits the Ilva steel plant, which ArcelorMittal is threatening to abandon over a legal row with the government, in Taranto, Italy, November 8, 2019. REUTERS/Ciro De Luca

Italian Prime Minister Giuseppe Conte arrives to visit the Ilva steel plant, which ArcelorMittal is threatening to abandon over a legal row with the government, in Taranto, Italy, November 8, 2019. REUTERS/Ciro De Luca

Italian Prime Minister Giuseppe Conte arrives to visit the Ilva steel plant, which ArcelorMittal is threatening to abandon over a legal row with the government, in Taranto, Italy, November 8, 2019. REUTERS/Ciro De Luca

Italian Prime Minister Giuseppe Conte arrives to visit the Ilva steel plant, which ArcelorMittal is threatening to abandon over a legal row with the government, in Taranto, Italy, November 8, 2019. REUTERS/Ciro De Luca

People protest as they wait for the arrival of Italian Prime Minister Giuseppe Conte outside the Ilva steel plant, which ArcelorMittal is threatening to abandon over a legal row with the government, in Taranto, Italy, November 8, 2019. The banners read: "Citizens and workers united for the reconversion" and "Closure and reconversion, the only solution". REUTERS/Ciro De Luca

People wait for the arrival of Italian Prime Minister Giuseppe Conte outside the Ilva steel plant, which ArcelorMittal is threatening to abandon over a legal row with the government, in Taranto, Italy, November 8, 2019. REUTERS/Ciro De Luca

People wait for the arrival of Italian Prime Minister Giuseppe Conte outside the Ilva steel plant, which ArcelorMittal is threatening to abandon over a legal row with the government, in Taranto, Italy, November 8, 2019. REUTERS/Ciro De Luca

Ilva steel plant workers are seen outside the plant during a 24-hour strike against ArcelorMittal's plan for thousands of job cuts at the troubled Ilva unit which it is threatening to abandon over a legal row with the government, in Taranto, Italy, November 8, 2019. REUTERS/Ciro De Luca

A worker from the Ilva steel plant sits outside the plant during a 24-hour strike against ArcelorMittal's plan for thousands of job cuts at the troubled Ilva unit which it is threatening to abandon over a legal row with the government, in Taranto, Italy, November 8, 2019. REUTERS/Ciro De Luca

Ilva steel plant workers are seen outside the plant during a 24-hour strike against ArcelorMittal's plan for thousands of job cuts at the troubled Ilva unit which it is threatening to abandon over a legal row with the government, in Taranto, Italy, November 8, 2019. REUTERS/Ciro De Luca

The Ilva steel plant, which ArcelorMittal is threatening to abandon over a legal row with the government, is seen in Taranto, Italy, November 8, 2019. REUTERS/Ciro De Luca

The Ilva steel plant, which ArcelorMittal is threatening to abandon over a legal row with the government, is seen in Taranto, Italy, November 8, 2019. REUTERS/Ciro De Luca

Ilva steel plant workers are seen outside the plant during a 24-hour strike against ArcelorMittal's plan for thousands of job cuts at the troubled Ilva unit which it is threatening to abandon over a legal row with the government, in Taranto, Italy, November 8, 2019. REUTERS/Ciro De Luca

The Ilva steel plant, which ArcelorMittal is threatening to abandon over a legal row with the government, is seen in Taranto, Italy, November 8, 2019. REUTERS/Ciro De Luca