Calves are fed a probiotic supplement called "Kowbucha," which has been shown to reduce the methane that they produce, as part of a trial at a Massey University's research farm in Palmerston North, New Zealand, September 7, 2022. REUTERS/Lucy Craymer 

Calves and oxen in a dry pasture during a drought in Beaumont, France, August 11, 2022. REUTERS/Pascal Rossignol 

Calves in a dry pasture during a drought in Beaumont, France August 11, 2022. REUTERS/Pascal Rossignol 

Marine Le Pen, French far-right National Rally (Rassemblement National) party candidate for the 2022 French presidential election, wearing a protective face mask, talks with patients as she visits the Center Jacques Calve - Fondation Hopale Physical Therapy Clinic in Berck-sur-Mer on the last day of campaigning, ahead of the second round of the presidential election, France, April 22, 2022. REUTERS/Yves Herman 

Marine Le Pen, French far-right National Rally (Rassemblement National) party candidate for the 2022 French presidential election, wearing a protective face mask, poses with a woman as she visits the Center Jacques Calve - Fondation Hopale Physical Therapy Clinic in Berck-sur-Mer on the last day of campaigning, ahead of the second round of the presidential election, France, April 22, 2022. REUTERS/Yves Herman 

Marine Le Pen, French far-right National Rally (Rassemblement National) party candidate for the 2022 French presidential election, wearing a protective face mask, talks with patients as she visits the Center Jacques Calve - Fondation Hopale Physical Therapy Clinic in Berck-sur-Mer on the last day of campaigning, ahead of the second round of the presidential election, France, April 22, 2022. REUTERS/Yves Herman 

Marine Le Pen, French far-right National Rally (Rassemblement National) party candidate for the 2022 French presidential election, wearing a protective face mask, shakes hands with patients as she visits the Center Jacques Calve - Fondation Hopale Physical Therapy Clinic in Berck-sur-Mer on the last day of campaigning, ahead of the second round of the presidential election, France, April 22, 2022. REUTERS/Yves Herman 

Marine Le Pen, French far-right National Rally (Rassemblement National) party candidate for the 2022 French presidential election, wearing a protective face mask, talks with patients as she visits the Center Jacques Calve - Fondation Hopale Physical Therapy Clinic in Berck-sur-Mer on the last day of campaigning, ahead of the second round of the presidential election, France, April 22, 2022. REUTERS/Yves Herman 

Calves stand in their pens at a cattle farm, in Barinas, Venezuela January 11, 2022. Picture taken January 11, 2022. REUTERS/Leonardo Fernandez Viloria 

Laurie Miller moves calves on her farm during an Extreme Cold Warning and wind chill of -38 Celsius (-36.4 F) north of Calgary, Alberta, Canada, January 4, 2022. Picture taken January 4, 2022. REUTERS/Valerie Zink 

Laurie Miller moves calves on her farm during an Extreme Cold Warning and wind chill of -38 Celsius (-36.4 F) north of Calgary, Alberta, Canada, January 4, 2022. Picture taken January 4, 2022. REUTERS/Valerie Zink 

Laurie Miller moves calves on her farm during an Extreme Cold Warning and wind chill of -38 Celsius (-36.4 F) north of Calgary, Alberta, Canada, January 4, 2022. Picture taken January 4, 2022. REUTERS/Valerie Zink 

Laurie Miller feeds calves on her farm during an Extreme Cold Warning and wind chill of -38 Celsius (-36.4 F) north of Calgary, Alberta, Canada, January 4, 2022. Picture taken January 4, 2022. REUTERS/Valerie Zink 

A farmer wearing protective face mask takes his calves out of a holding pen at Carrigallen Mart livestock cattle auction as the coronavirus disease (COVID-19) restrictions continue to ease in Carrigallen, Ireland, May 22, 2021. REUTERS/Clodagh Kilcoyne 

A farmer wearing protective face masks view calves before the auction for charity called 'Hooves for Hospice' where farmers donate calves to raise funds towards the cost of building a Midland Regional Hospice, at Carrigallen Mart as the coronavirus disease (COVID-19) restrictions continue to ease in Carrigallen, Ireland, May 22, 2021. REUTERS/Clodagh Kilcoyne 

A farmer wearing a protective face mask makes notes about calves in a pen at the Carrigallen Mart cattle auction as the coronavirus disease (COVID-19) restrictions continue to ease in Carrigallen, Ireland, May 22, 2021. REUTERS/Clodagh Kilcoyne 

Farmers wearing protective face masks view calves at an auction for charity called 'Hooves for Hospice' where farmers donate calves to raise funds towards the cost of building a Midland Regional Hospice, at Carrigallen Mart as the coronavirus disease (COVID-19) restrictions continue to ease in Carrigallen, Ireland, May 22, 2021. REUTERS/Clodagh Kilcoyne 

Calves are seen in a holding pen at the Carrigallen Mart livestock cattle auction as the coronavirus disease (COVID-19) restrictions continue to ease in Carrigallen, Ireland, May 22, 2021. REUTERS/Clodagh Kilcoyne TPX IMAGES OF THE DAY 

Calves are seen in a detention pen at the Carrigallen Mart livestock cattle auction as the coronavirus disease (COVID-19) restrictions continue to ease in Carrigallen, Ireland, May 22, 2021. REUTERS/Clodagh Kilcoyne 

Farmers wearing protective face masks watch over calves in pens at the Carrigallen Mart cattle auction as the coronavirus disease (COVID-19) restrictions continue to ease in Carrigallen, Ireland, May 22, 2021. REUTERS/Clodagh Kilcoyne 

Farmers wearing protective face masks view calves at a cattle auction at Carrigallen Mart as the coronavirus disease (COVID-19) restrictions continue to ease in Carrigallen, Ireland, May 22, 2021. REUTERS/Clodagh Kilcoyne 

Farmers wearing protective face masks view calves before the auction for charity called 'Hooves for Hospice' where farmers donate calves to raise funds towards the cost of building a Midland Regional Hospice, at Carrigallen Mart as the coronavirus disease (COVID-19) restrictions continue to ease in Carrigallen, Ireland, May 22, 2021. REUTERS/Clodagh Kilcoyne 

Britain's Prime Minister Boris Johnson feeds calves as he visits Moreton farm near Wrexham, Wales, Britain April 26, 2021. Paul Ellis/Pool via REUTERS 

Calves look out as they are transported in a cart in the village of Litkovka, in Omsk region, Russia March 20, 2021. Picture taken March 20, 2021. REUTERS/Alexey Malgavko TPX IMAGES OF THE DAY 

Organic dairy farmer Meg Stuedemann cleans feeding bottles for calves next to the bulk tank inside the Derrydale Farm milking parlor in Belle Plaine, Minnesota, U.S., October 24, 2020. Picture taken October 24, 2020. REUTERS/Bing Guan 

Organic dairy farmer Meg Stuedemann holds open a wire gate as her husband Kevin Stuedemann drives a Bobcat 743 skid steer loader while feeding corn silage to calves on Derrydale Farm in Belle Plaine, Minnesota, U.S., October 24, 2020. Picture taken October 24, 2020. REUTERS/Bing Guan 

Organic dairy farmer Meg Stuedemann holds open a wire gate as her husband Kevin Stuedemann drives a Bobcat 743 skid steer loader while feeding corn silage to calves on Derrydale Farm in Belle Plaine, Minnesota, U.S., October 24, 2020. Picture taken October 24, 2020. REUTERS/Bing Guan 

African elephant calves, which were born at Africam Safari zoo as part of its breeding programme, are seen with their mothers at their enclosure, in Valsequillo, Mexico August 12, 2020. REUTERS/Imelda Medina 

African elephant calves, which were born at Africam Safari zoo as part of its breeding programme, are seen with their mothers at their enclosure, in Valsequillo, Mexico August 12, 2020. REUTERS/Imelda Medina 

African elephant calves, which were born at Africam Safari zoo as part of its breeding programme, are seen at their enclosure, in Valsequillo, Mexico August 12, 2020. REUTERS/Imelda Medina 

African elephant calves, which were born at Africam Safari zoo as part of its breeding programme, are seen at their enclosure, in Valsequillo, Mexico August 12, 2020. REUTERS/Imelda Medina 

Alfred Brandt and his son, Sam Brandt, 8, look at their Holstein calves on the dairy farm that's been in their family since 1840 and been affected by the industry's supply chain disruptions created by the coronavirus disease (COVID-19), in Linn, Missouri, U.S. April 28, 2020. Brandt, along with other U.S. dairy farmers, has seen a drop in milk prices and has been forced to dump excess milk as a result of the closure of schools, restaurants and coffee shops. REUTERS/Whitney Curtis 

Holstein calves are seen at Alfred Brandt's dairy farm, which has been in his family since 1840 and has been affected by the industry's supply chain disruptions created by the coronavirus disease (COVID-19), in Linn, Missouri, U.S. April 28, 2020. Brandt, along with other U.S. dairy farmers, has seen a drop in milk prices and has been forced to dump excess milk as a result of the closure of schools, restaurants and coffee shops. REUTERS/Whitney Curtis 

Calves stand together in their shed at a farm in Be'er Tuvia, southern Israel February 5, 2020. Picture taken February 5, 2020. REUTERS/Amir Cohen 

A labourer and Israeli farmer Guy Golan tend to calves in their shed at his farm in Be'er Tuvia, southern Israel February 5, 2020. Picture taken February 5, 2020. REUTERS/Amir Cohen 

A labourer feeds calves in their shed at a farm in Be'er Tuvia, southern Israel February 5, 2020. Picture taken February 5, 2020. REUTERS/Amir Cohen 

Calves stand together in their shed at a farm in Be'er Tuvia, southern Israel February 5, 2020. Picture taken February 5, 2020. REUTERS/Amir Cohen 

Calves stand together in their shed at a farm in Be'er Tuvia, southern Israel February 5, 2020. Picture taken February 5, 2020. REUTERS/Amir Cohen 

The remaining calves belonging to dairy farmer Tim Salway stand on his farm in Wandella, as smoke from the bushfires blankets the area near the town of Cobargo, New South Wales, Australia, January 13, 2020. REUTERS/Alkis Konstantinidis SEARCH "COBARGO BUSHFIRE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES 

A few of the remaining calves of dairy farmer Tim Salway are seen in his farm in Wandella, near the town of Cobargo, Australia January 13, 2020. Most of Salway's farm was destroyed including storage facilities, fences and hundreds of cattle. Picture taken January 13, 2020. REUTERS/Alkis Konstantinidis 

The remaining calves of dairy farmer Tim Salway drink water at his farm in Wandella, near the town of Cobargo, Australia January 13, 2020. Most of Salway's farm was destroyed including storage facilities, fences and hundreds of cattle. Picture taken January 13, 2020. REUTERS/Alkis Konstantinidis 

Dairy farmer and former local mayor of the Bega Valley Shire, Tony Allen, stands next to calves at his farm in the town of Cobargo, Australia January 13, 2020. Picture taken January 13, 2020. REUTERS/Alkis Konstantinidis 

Calves are seen at the farm of dairy farmer and former local mayor of the Bega Valley Shire, Tony Allen, in the town of Cobargo, Australia January 13, 2020. Picture taken January 13, 2020. REUTERS/Alkis Konstantinidis 

A destroyed storage facility is seen in front of the remaining calves of dairy farmer Tim Salway in his farm in Wandella, near the town of Cobargo, Australia January 13, 2020. Most of Salway's farm was destroyed including storage facilities, fences and hundreds of cattle. Picture taken January 13, 2020. REUTERS/Alkis Konstantinidis 

Cows partly covered by ashes eat grass in a land nearby the erupting Taal Volcano in Talisay, Batangas, Philippines, January 13, 2020. REUTERS/Eloisa Lopez 

Cows partly covered by ashes eat grass in a land nearby the erupting Taal Volcano in Talisay, Batangas, Philippines, January 13, 2020. REUTERS/Eloisa Lopez 

Paul Giese, feeds some newly acquired dairy calves at the family farm, God Green Acres in Mayville, Wisconsin, U.S., June 24, 2019. Picture taken June 24, 2019. REUTERS/Darren Hauck 

Gordon A. Giese, 66, and his son Paul Giese get ready to feed baby calves at the family farm, God Green Acres in Mayville, Wisconsin, U.S., June 24, 2019. Picture taken June 24, 2019. REUTERS/Darren Hauck 

Calves rest in a field in front of houses in Sullens near Lausanne, Switzerland April 30 2019. REUTERS/Denis Balibouse 

Calves rest in a field in front of houses in Sullens near Lausanne, Switzerland April 30 2019. REUTERS/Denis Balibouse 

Calves are seen in a stable at a ranch as the Caribbean nation endures its worst drought in 30 years, in Santiago Rodriguez, Dominican Republic March 16, 2019. Picture taken March 16, 2019. REUTERS/Ricardo Rojas 

Veterinarian Jean-Marie Surer anaesthetises calves before removing their horns, ahead of a national vote on the horned cow initiative (Hornkuh-Initiative) on November 25, at a farm in Marchissy, Switzerland, November 15, 2018. Picture taken November 15, 2018. REUTERS/Denis Balibouse 

Three cows stand in the summer heat at the recently closed Cottrell Homestead dairy farm in West Kingston, Rhode Island, U.S., 14 July 2018. The Cottrell Homestead at its peak was home to over 80 cows. Today, the farm houses less than 20, some of which are just being boarded there by their owners. They milk what they need to feed the calves, and dump the rest. REUTERS/Oliver Doyle SEARCH "USA DAIRY" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Ocean water is pushed up by the bottom of a pinnacle iceberg as it falls back during a large calving event at the Helheim glacier near Tasiilaq, Greenland, June 22, 2018. REUTERS/Lucas Jackson 

A large crevasse forms near the calving front of the Helheim glacier near Tasiilaq, Greenland, June 22, 2018. REUTERS/Lucas Jackson 

Tabular icebergs float in the Sermilik Fjord after a large calving event at the Helheim glacier near Tasiilaq, Greenland, June 23, 2018. REUTERS/Lucas Jackson 

Tabular icebergs float in the Sermilik Fjord after a large calving event at the Helheim glacier near Tasiilaq, Greenland, June 23, 2018. REUTERS/Lucas Jackson 

A large crevasse forms near the calving front of the Helheim glacier near Tasiilaq, Greenland, June 22, 2018. REUTERS/Lucas Jackson SEARCH "JACKSON GREENLAND" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Tabular icebergs float in the Sermilik Fjord after a large calving event at the Helheim glacier near Tasiilaq, Greenland, June 23, 2018. REUTERS/Lucas Jackson SEARCH "JACKSON GREENLAND" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Tabular icebergs float in the Sermilik Fjord after a large calving event at the Helheim glacier near Tasiilaq, Greenland, June 23, 2018. This portion between the glacier front and the open ocean is known as the "melange" and is filled with ice, snow and icebergs packed together on their way to a fjord and later the ocean. REUTERS/Lucas Jackson SEARCH "JACKSON GREENLAND" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY