A view shows a non-operating smelting shop in the town of Nikel in Murmansk Region, Russia February 26, 2021. The smelter, which was the oldest production facility of Russian miner Norilsk Nickel, was closed in 2020 as part of the company's environmental programme aiming to reduce hazardous emissions into the atmosphere. REUTERS/Evgenia Novozhenina

A view shows the logo of Norilsk Nickel company at a non-operating smelting shop in the town of Nikel in Murmansk Region, Russia February 26, 2021. The smelter, which was the oldest production facility of Russian miner Norilsk Nickel, was closed in 2020 as part of the company's environmental programme aiming to reduce hazardous emissions into the atmosphere. REUTERS/Evgenia Novozhenina

A view shows a non-operating smelting shop in the town of Nikel in Murmansk Region, Russia February 26, 2021. The smelter, which was the oldest production facility of Russian miner Norilsk Nickel, was closed in 2020 as part of the company's environmental programme aiming to reduce hazardous emissions into the atmosphere. REUTERS/Evgenia Novozhenina

A view shows a non-operating smelting shop in the town of Nikel in Murmansk Region, Russia February 26, 2021. The smelter, which was the oldest production facility of Russian miner Norilsk Nickel, was closed as part of the company's environmental programme aiming to reduce hazardous emissions into the atmosphere. REUTERS/Evgenia Novozhenina

A view shows a non-operating smelting shop in the town of Nikel in Murmansk Region, Russia February 26, 2021. The smelter, which was the oldest production facility of Russian miner Norilsk Nickel, was closed as part of the company's environmental programme aiming to reduce hazardous emissions into the atmosphere. REUTERS/Evgenia Novozhenina

An interior view shows a non-operating smelting shop in the town of Nikel in Murmansk Region, Russia February 26, 2021. The smelter, which was the oldest production facility of Russian miner Norilsk Nickel, was closed as part of the company's environmental programme aiming to reduce hazardous emissions into the atmosphere. REUTERS/Evgenia Novozhenina

The national flag flies outside the thermoelectric plant Bocamina's Unit I after it was closed today amid a drive by Chile to end carbon emissions from its grid, in Coronel, Chile December 31, 2020. REUTERS/Jose Luis Saavedra

Residents gather outside the thermoelectric Bocamina's Unit I after it was closed amid a drive by Chile to end carbon emissions from its grid, in Coronel, Chile December 31, 2020. REUTERS/Jose Luis Saavedra

The thermoelectric plant Bocamina is seen after Unit I was closed today amid a drive by Chile to end carbon emissions from its grid, in Coronel, Chile December 31, 2020. REUTERS/Jose Luis Saavedra

Residents hold a national flag while celebrating the closure of the thermoelectric Bocamina's Unit I amid a drive by Chile to end carbon emissions from its grid, in Coronel, Chile December 31, 2020. REUTERS/Jose Luis Saavedra

Kristofer Frojd (L), head of business development at the power distributor Ellevio, oversees the installation of electric vehicle chargers on Valhallavagen, the city's longest street, as part of preparation for larger numbers of zero-emission cars in Stockholm, Sweden December 4, 2020. Picture taken December 4, 2020. REUTERS/Helena Soderpalm

Kristofer Frojd, head of business development at the power distributor Ellevio, oversees the installation of electric vehicle chargers on Valhallavagen, the city's longest street, as part of preparation for larger numbers of zero-emission cars in Stockholm, Sweden December 4, 2020. Picture taken December 4, 2020. REUTERS/Helena Soderpalm

Workers of the power distributor Ellevio install electric vehicle chargers on Valhallavagen, the city's longest street, as part of preparation for larger numbers of zero-emission cars in Stockholm, Sweden December 4, 2020. Picture taken December 4, 2020. REUTERS/Helena Soderpalm

Workers of the power distributor Ellevio install electric vehicle chargers on Valhallavagen, the city's longest street, as part of preparation for larger numbers of zero-emission cars in Stockholm, Sweden December 4, 2020. Picture taken December 4, 2020. REUTERS/Helena Soderpalm

Workers install public electric vehicle chargers on Valhallavagen, the city's longest street, as part of preparation for larger numbers of zero-emission cars in Stockholm, Sweden December 4, 2020. Picture taken December 4, 2020. REUTERS/Helena Soderpalm

Workers of the power distributor Ellevio install electric vehicle chargers on Valhallavagen, the city's longest street, as part of preparation for larger numbers of zero-emission cars in Stockholm, Sweden December 4, 2020. Picture taken December 4, 2020. REUTERS/Helena Soderpalm

Ander Echevarria, founder of the building company specialised in all-wood, low-emission homes 100x100 Madera, points out on a screen on an iPad, as he checks the air quality in his house with an application, in Guadalix de la Sierra, Spain, November 27, 2020. Picture taken November 27, 2020. REUTERS/Sergio Perez

Ander Echevarria, founder of the building company specialised in all-wood, low-emission homes 100x100 Madera, checks the air quality in his house with an application installed on an iPad, in Guadalix de la Sierra, Spain, November 27, 2020. Picture taken November 27, 2020. REUTERS/Sergio Perez

Ander Echevarria, founder of the building company specialised in all-wood, low-emission homes 100x100 Madera, checks the air quality in his house with an application installed on an iPad, in Guadalix de la Sierra, Spain, November 27, 2020. Picture taken November 27, 2020. REUTERS/Sergio Perez

A Renault ZE (Zero Emission) logo for electric cars is seen at a Renault automobile dealership in Cagnes-Sur-Mer, France, October 22, 2020. Picture taken October 22, 2020. REUTERS/Eric Gaillard

Mark Freymuller, CEO of the Hyundai Hydrogen Mobility, attends a news conference for a new hydrogen fuel cell truck made by Hyundai during a media presentation for the zero-emission transport of goods at the Verkehrshaus Luzern (Swiss Museum of Transport) in Luzern, Switzerland October 7, 2020. REUTERS/Denis Balibouse

A sign on a new hydrogen fuel cell truck made by Hyundai is pictured during a media presentation for the zero-emission transport of goods at the Verkehrshaus Luzern (Swiss Museum of Transport) in Luzern, Switzerland October 7, 2020. REUTERS/Denis Balibouse

New hydrogen fuel cell trucks made by Hyundai are pictured ahead of a media presentation for the zero-emission transport of goods at the Verkehrshaus Luzern (Swiss Museum of Transport) in Luzern, Switzerland October 7, 2020. REUTERS/Denis Balibouse

A new hydrogen fuel cell truck made by Hyundai is pictured ahead of a media presentation for the zero-emission transport of goods at the Verkehrshaus Luzern (Swiss Museum of Transport) in Luzern, Switzerland October 7, 2020. REUTERS/Denis Balibouse

New hydrogen fuel cell trucks made by Hyundai are pictured ahead of a media presentation for the zero-emission transport of goods at the Verkehrshaus Luzern (Swiss Museum of Transport) in Luzern, Switzerland October 7, 2020. REUTERS/Denis Balibouse

A new hydrogen fuel cell truck made by Hyundai is pictured ahead of a media presentation for the zero-emission transport of goods at the Verkehrshaus Luzern (Swiss Museum of Transport) in Luzern, Switzerland October 7, 2020. REUTERS/Denis Balibouse

A new hydrogen fuel cell truck made by Hyundai is pictured ahead of a media presentation for the zero-emission transport of goods at the Verkehrshaus Luzern (Swiss Museum of Transport) in Luzern, Switzerland October 7, 2020. REUTERS/Denis Balibouse

New hydrogen fuel cell trucks made by Hyundai are pictured ahead of a media presentation for the zero-emission transport of goods at the Verkehrshaus Luzern (Swiss Museum of Transport) in Luzern, Switzerland October 7, 2020. REUTERS/Denis Balibouse

A cameraman films before a news conference for a new hydrogen fuel cell truck made by Hyundai during a media presentation for the zero-emission transport of goods at the Verkehrshaus Luzern (Swiss Museum of Transport) in Luzern, Switzerland October 7, 2020. REUTERS/Denis Balibouse

Defendant Rupert Stadler, former CEO of Volkswagen's Audi brand and his lawyer Ulrike Thole-Groll sit a court room in Munich, Germany, October 7, 2020, after VW admitted in September 2015 to having used illegal engine control software to cheat pollution tests, triggering a global backlash against diesel. Peter Kneffel/Pool via REUTERS

Defendant Rupert Stadler, former CEO of Volkswagen's Audi brand and his lawyer Ulrike Thole-Groll sit a court room in Munich, Germany, October 7, 2020, after VW admitted in September 2015 to having used illegal engine control software to cheat pollution tests, triggering a global backlash against diesel. Peter Kneffel/Pool via REUTERS

Defendant Rupert Stadler, former CEO of Volkswagen's Audi brand sits in a court in Munich, Germany, October 7, 2020, after VW admitted in September 2015 to having used illegal engine control software to cheat pollution tests, triggering a global backlash against diesel. Peter Kneffel/Pool via REUTERS

Defendant Rupert Stadler, former CEO of Volkswagen's Audi brand sits in a court in Munich, Germany, October 7, 2020, after VW admitted in September 2015 to having used illegal engine control software to cheat pollution tests, triggering a global backlash against diesel. Peter Kneffel/Pool via REUTERS

Defendant Rupert Stadler, former CEO of Volkswagen's Audi brand sits in a court in Munich, Germany, October 7, 2020, after VW admitted in September 2015 to having used illegal engine control software to cheat pollution tests, triggering a global backlash against diesel. Peter Kneffel/Pool via REUTERS

Defendant Rupert Stadler, former CEO of Volkswagen's Audi brand sits in a court in Munich, Germany, October 7, 2020, after VW admitted in September 2015 to having used illegal engine control software to cheat pollution tests, triggering a global backlash against diesel. Peter Kneffel/Pool via REUTERS

Defendant Rupert Stadler, former CEO of Volkswagen's Audi brand sits in a court in Munich, Germany, October 7, 2020, after VW admitted in September 2015 to having used illegal engine control software to cheat pollution tests, triggering a global backlash against diesel. Peter Kneffel/Pool via REUTERS

Defendant Rupert Stadler, former CEO of Volkswagen's Audi brand sits in a court in Munich, Germany, October 7, 2020, after VW admitted in September 2015 to having used illegal engine control software to cheat pollution tests, triggering a global backlash against diesel. Peter Kneffel/Pool via REUTERS

Defendant Rupert Stadler, former CEO of Volkswagen's Audi brand sits in a court in Munich, Germany, October 7, 2020, after VW admitted in September 2015 to having used illegal engine control software to cheat pollution tests, triggering a global backlash against diesel. Peter Kneffel/Pool via REUTERS

Defendant Rupert Stadler, former CEO of Volkswagen's Audi brand sits in a court in Munich, Germany, October 7, 2020, after VW admitted in September 2015 to having used illegal engine control software to cheat pollution tests, triggering a global backlash against diesel. Peter Kneffel/Pool via REUTERS

Defendant Rupert Stadler, former CEO of Volkswagen's Audi brand sits in a court in Munich, Germany, October 7, 2020, after VW admitted in September 2015 to having used illegal engine control software to cheat pollution tests, triggering a global backlash against diesel. Peter Kneffel/Pool via REUTERS

Judge Stefan Weickert arrives in a regional court room in Munich, Germany, October 6, 2020. Matthias Schrader/Pool via REUTERS

Judge Stefan Weickert arrives in a regional court room in Munich, Germany, October 6, 2020. Matthias Schrader/Pool via REUTERS

Rupert Stadler, former CEO of German car manufacturer Audi and former Audi engineer Wolfgang Hatz sit besides their lawyers in a regional court room in Munich, Germany, October 6, 2020. Matthias Schrader/Pool via REUTERS

Rupert Stadler, former CEO of German car manufacturer Audi and former Audi engineer Wolfgang Hatz sit besides their lawyers in a regional court room in Munich, Germany, October 6, 2020. Matthias Schrader/Pool via REUTERS

Former Audi engineer Wolfgang Hatz and his lawyers Joerg Habetha and Gerson Trueg sit in a regional court room in Munich, Germany, October 6, 2020. Matthias Schrader/Pool via REUTERS

Rupert Stadler, former CEO of German car manufacturer Audi, sits in a regional court room in Munich, Germany, October 6, 2020. Matthias Schrader/Pool via REUTERS

Rupert Stadler, former CEO of German car manufacturer Audi sits besides his lawyer Ulrike Thole-Groll in a regional court room in Munich, Germany, October 6, 2020. Matthias Schrader/Pool via REUTERS

Rupert Stadler, former CEO of German car manufacturer Audi, talks to his lawyers Ulrike Thole-Groll and Thilo Pfordte in a regional court room in Munich, Germany, October 6, 2020. Matthias Schrader/Pool via REUTERS

Rupert Stadler, former CEO of German car manufacturer Audi, sits in a regional court room in Munich, Germany, October 6, 2020. Matthias Schrader/Pool via REUTERS

Rupert Stadler, former CEO of German car manufacturer Audi, sits in a regional court room in Munich, Germany, October 6, 2020. Matthias Schrader/Pool via REUTERS

Rupert Stadler, former CEO of German car manufacturer Audi, sits in a regional court room in Munich, Germany, October 6, 2020. Matthias Schrader/Pool via REUTERS

The Arctic is warming and some scientists believe that thawing permafrost is about to release enormous amounts of climate-warming emissions.

The Arctic is warming and some scientists believe that thawing permafrost is about to release enormous amounts of climate-warming emissions.

The Arctic is warming and some scientists believe that thawing permafrost is about to release enormous amounts of climate-warming emissions.

General view shows the University of Cambridge, as it pledges to reduce the climate-warming emissions from its investments to net zero by 2038, in Cambridge, Britain, October 1, 2020. REUTERS/Matthew Childs

General view shows the University of Cambridge, as it pledges to reduce the climate-warming emissions from its investments to net zero by 2038, in Cambridge, Britain, October 1, 2020. REUTERS/Matthew Childs

General view shows the University of Cambridge, as it pledges to reduce the climate-warming emissions from its investments to net zero by 2038, in Cambridge, Britain, October 1, 2020. REUTERS/Matthew Childs

General view shows the University of Cambridge, as it pledges to reduce the climate-warming emissions from its investments to net zero by 2038, in Cambridge, Britain, October 1, 2020. REUTERS/Matthew Childs

General view shows the University of Cambridge, as it pledges to reduce the climate-warming emissions from its investments to net zero by 2038, in Cambridge, Britain, October 1, 2020. REUTERS/Matthew Childs

General view shows the University of Cambridge, as it pledges to reduce the climate-warming emissions from its investments to net zero by 2038, in Cambridge, Britain, October 1, 2020. REUTERS/Matthew Childs