Artistic Gymnastics - 2019 World Artistic Gymnastics Championships - Men's Qualifications - Vault - Hanns-Martin-Schleyer-Halle, Stuttgart, Germany - October 6, 2019 Germany's Philipp Herder in action REUTERS/Wolfgang Rattay

Artistic Gymnastics - 2019 World Artistic Gymnastics Championships - Men's Qualifications - Rings - Hanns-Martin-Schleyer-Halle, Stuttgart, Germany - October 6, 2019 Germany's Philipp Herder in action REUTERS/Wolfgang Rattay

Artistic Gymnastics - 2019 World Artistic Gymnastics Championships - Men's Qualifications - Rings - Hanns-Martin-Schleyer-Halle, Stuttgart, Germany - October 6, 2019 Germany's Philipp Herder in action REUTERS/Wolfgang Rattay

Artistic Gymnastics - 2019 World Artistic Gymnastics Championships - Men's Qualifications - Rings - Hanns-Martin-Schleyer-Halle, Stuttgart, Germany - October 6, 2019 Germany's Philipp Herder in action REUTERS/Wolfgang Rattay

Artistic Gymnastics - 2019 World Artistic Gymnastics Championships - Men's Qualifications - Pommel Horse - Hanns-Martin-Schleyer-Halle, Stuttgart, Germany - October 6, 2019 Germany's Philipp Herder in action REUTERS/Wolfgang Rattay

Artistic Gymnastics - 2019 World Artistic Gymnastics Championships - Men's Qualifications - Pommel Horse - Hanns-Martin-Schleyer-Halle, Stuttgart, Germany - October 6, 2019 Germany's Philipp Herder in action REUTERS/Wolfgang Rattay

Artistic Gymnastics - 2019 World Artistic Gymnastics Championships - Men's Qualifications - Horizontal Bar - Hanns-Martin-Schleyer-Halle, Stuttgart, Germany - October 6, 2019 Germany's Philipp Herder in action REUTERS/Wolfgang Rattay

Artistic Gymnastics - 2019 World Artistic Gymnastics Championships - Men's Qualifications - Horizontal Bar - Hanns-Martin-Schleyer-Halle, Stuttgart, Germany - October 6, 2019 Germany's Philipp Herder in action REUTERS/Wolfgang Rattay

Artistic Gymnastics - 2019 World Artistic Gymnastics Championships - Men's Qualifications - Horizontal Bar - Hanns-Martin-Schleyer-Halle, Stuttgart, Germany - October 6, 2019 Germany's Philipp Herder in action REUTERS/Wolfgang Rattay

Artistic Gymnastics - 2019 World Artistic Gymnastics Championships - Men's Qualifications - Horizontal Bar - Hanns-Martin-Schleyer-Halle, Stuttgart, Germany - October 6, 2019 Germany's Philipp Herder in action REUTERS/Wolfgang Rattay

Map showing area in Qinghai province where China's biggest national park will be opened next year.

A general view shows homes of Tibetan herders in a resettlement village built by local authorities in Madoi county, Golog Tibetan Autonomous Prefecture, Qinghai province, China August 31, 2019. Picture taken August 31, 2019. REUTERS/Ryan Woo

A camel herder collects feces at a farm in Adhen Village, Ras al Khaimah, United Arab Emirates July 16, 2019. Picture taken July 16, 2019. REUTERS/Christopher Pike

A camel herder collects feces at a farm in Adhen Village, Ras al Khaimah, United Arab Emirates July 16, 2019. Picture taken July 16, 2019. REUTERS/Christopher Pike

A camel herder collects feces at a farm in Adhen Village, Ras al Khaimah, United Arab Emirates July 16, 2019. Picture taken July 16, 2019. REUTERS/Christopher Pike

A camel herder collects feces at a farm in Adhen Village, Ras al Khaimah, United Arab Emirates July 16, 2019. Picture taken July 16, 2019. REUTERS/Christopher Pike

A camel herder walks near Adhen Village, Ras al Khaimah, United Arab Emirates July 16, 2019. Picture taken July 16, 2019. REUTERS/Christopher Pike

A camel herder walks near Adhen Village, Ras al Khaimah, United Arab Emirates July 16, 2019. Picture taken July 16, 2019. REUTERS/Christopher Pike

A Tibetan herder leads his yaks through a mountain in the Amne Machin range in China’s western Qinghai province, June 7, 2019. REUTERS/Aly Song

Herders drive cattle, which were raised on pasture grown on an area of deforested Amazon rainforest, along the Trans-Amazonian highway near the city of Uruara, Para State, Brazil, April 25, 2013. Picture taken April 25, 2013. REUTERS/Nacho Doce

Turkana warriors pass by a skull of a Dassenach warrior who was, according to a Turkana warrior, killed when he tried to ambush Turkana cattle herders in Ilemi Triangle, Kenya March 26, 2019. Picture taken on March 26, 2019. REUTERS/Goran Tomasevic TPX IMAGES OF THE DAY

A skull of a Dassenach warrior who was, according to a Turkana warrior, killed when he tried to ambush Turkana cattle herders is seen in Ilemi Triangle, Kenya March 26, 2019. Picture taken on March 26, 2019. REUTERS/Goran Tomasevic TPX IMAGES OF THE DAY

Turkana warriors look at a skull of a Dassenach warrior who was, according to a Turkana warrior, killed when he tried to ambush Turkana cattle herders in Ilemi Triangle, Kenya March 26, 2019. Picture taken on March 26, 2019. REUTERS/Goran Tomasevic

A skull of a Dassenach warrior who was, according to a Turkana warrior, killed when he tried to ambush Turkana cattle herders is seen in Ilemi Triangle, Kenya March 26, 2019. Picture taken on March 26, 2019. REUTERS/Goran Tomasevic

Turkana warriors pass by a skull of a Dassenach warrior who was, according to a Turkana warrior, killed when he tried to ambush Turkana cattle herders in Ilemi Triangle, Kenya March 26, 2019. Picture taken on March 26, 2019. REUTERS/Goran Tomasevic

Hassan Dikko Wanbai, the head of a Fulani herder community, sits during an interview with Reuters in Paiko, Niger State, Nigeria November 27, 2018. Picture taken November 27, 2018. REUTERS/Afolabi Sotunde

A view shows an IDP camp housing families, who escaped violence between herders and farming communities, in Daudu, on the outskirts of Makurdi, Nigeria November 29, 2018. Picture taken November 29, 2018. REUTERS/Afolabi Sotundi

A view shows an IDP camp housing families, who escaped violence between herders and farming communities, in Daudu on the outskirts of Makurdi, Nigeria November 29, 2018. Picture taken November 29, 2018. REUTERS/Afolabi Sotundi

Reuters analysis of satellite data shows how a massive expansion of farming in Nigeria's Middle Belt has cut access to grazing land for nomadic herders and fuelled persistent violence

Reuters analysis of satellite data shows how a massive expansion of farming in Nigeria's Middle Belt has cut access to grazing land for nomadic herders and fuelled persistent violence embed code and instructions: https://reut.rs/2R5kOJ7

Tsetse, six-year-old daughter of Dukha herder Erdenebat Chuluu, sits among her family's reindeer in a forest near the village of Tsagaannuur, Khovsgol aimag, Mongolia, April 21, 2018. REUTERS/Thomas Peter SEARCH "POY GLOBAL" FOR FOR THIS STORY. SEARCH "REUTERS POY" FOR ALL BEST OF 2018 PACKAGES. TPX IMAGES OF THE DAY.

Osai Ojigho, Amnesty International's Nigeria Director, attends the launch of the report: "Harvest of Death: Three Years of Bloody Clashes Between Farmers and Herders" in Abuja, Nigeria December 17, 2018. REUTERS/Afolabi Sotunde

Tsetse, six-year-old daughter of Dukha herder Erdenebat Chuluu, sits among her family's reindeer in a forest near the village of Tsagaannuur, Khovsgol aimag, Mongolia, April 21, 2018. REUTERS/Thomas Peter SEARCH "POY GLOBAL" FOR FOR THIS STORY. SEARCH "REUTERS POY" FOR ALL BEST OF 2018 PACKAGES. TPX IMAGES OF THE DAY.

A Palestinian woman herds animals in the Bedouin village of Khan al-Ahmar, in the occupied West Bank September 6, 2018. REUTERS/Ammar Awad TPX IMAGES OF THE DAY

A Cowboy pushes a herd of cattle in the municipality of Guadalupe, in the Juarez Valley, Mexico August 18, 2018. REUTERS/Jose Luis Gonzalez TPX IMAGES OF THE DAY

Map locating projects in development in northern Scandinavian and northern European Russia.

Reindeer walk on the Finnmark Plateau, Norway, June 16, 2018. REUTERS/Stoyan Nenov SEARCH "ARCTIC NENOV" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY. TPX IMAGES OF THE DAY

Sami reindeer herder Nils Mathis Sara, 60, drives his ATV as he follows a herd of reindeer, on the Finnmark Plateau, Norway, June 16, 2018. REUTERS/Stoyan Nenov SEARCH "ARCTIC NENOV" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY. TPX IMAGES OF THE DAY

Sami reindeer herder Nils Mathis Sara, 60, smokes next to a small cabin after midnight near Lake Iesjavri, in the Finnmark Plateau, Norway, June 16, 2018. REUTERS/Stoyan Nenov SEARCH "ARCTIC NENOV" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A view of Lake Iesjavri from the window of a small cabin, in the Finnmark Plateau, Norway, June 15, 2018. REUTERS/Stoyan Nenov. SEARCH "ARCTIC NENOV" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Sami reindeer herder Nils Mathis Sara, 60, cuts dried reindeer meat inside a small cabin near Lake Iesjavri, in the Finnmark Plateau, Norway, June 15, 2018. REUTERS/Stoyan Nenov. SEARCH "ARCTIC NENOV" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A woman knits as reindeer graze in front of her house in Hammerfest, Norway, June 14, 2018. REUTERS/Stoyan Nenov. SEARCH "ARCTIC NENOV" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Sami reindeer herder Nils Mathis Sara, 60, shelters from the wind in order to smoke next to his ATV in the Finnmark Plateau, Norway, June 15, 2018. REUTERS/Stoyan Nenov. SEARCH "ARCTIC NENOV" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Reindeer graze near a building in Hammerfest, Norway, June 14, 2018. REUTERS/Stoyan Nenov. SEARCH "ARCTIC NENOV" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Sami reindeer herder Nils Mathis Sara, 60, drives his ATV across the Finnmark Plateau, Norway, June 16, 2018. REUTERS/Stoyan Nenov. SEARCH "ARCTIC NENOV" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Sami reindeer herder Nils Mathis Sara, 60, and his grandson Johan Niilas Sara, 8, stand outside their house in Masi, Norway, June 16, 2018. REUTERS/Stoyan Nenov SEARCH "ARCTIC NENOV" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Sami reindeer herder Nils Mathis Sara, 60, repairs a fence used by herders in the Finnmark Plateau, Norway, June 15, 2018. REUTERS/Stoyan Nenov. SEARCH "ARCTIC NENOV" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Sami reindeer herder Nils Mathis Sara, 60, collects a reindeer antler on the Finnmark Plateau, Norway, June 16, 2018. REUTERS/Stoyan Nenov. SEARCH "ARCTIC NENOV" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Sami reindeer herder Nils Mathis Sara, 60, uses binoculars to search for reindeer near Kvalsund, Norway, June 14, 2018. REUTERS/Stoyan Nenov SEARCH "ARCTIC NENOV" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Reindeer graze close to a road near Skaidi, Norway, June 13, 2018. REUTERS/Stoyan Nenov. SEARCH "ARCTIC NENOV" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Sami reindeer herder Nils Mathis Sara, 60, takes a rest in a small cabin near Lake Iesjavri, as his dog Chappe waits outside, in the Finnmark Plateau, Norway, June 16, 2018. REUTERS/Stoyan Nenov SEARCH "ARCTIC NENOV" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY. TPX IMAGES OF THE DAY

Reindeer graze beneath a rainbow on the Finnmark Plateau, Norway, June 15, 2018. REUTERS/Stoyan Nenov SEARCH "ARCTIC NENOV" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Captured king crabs are collected on the boat of sea Sami fisherman Tommy Pettersen, 47, in Repparfjord, Norway, June 13, 2018. REUTERS/Stoyan Nenov SEARCH "ARCTIC NENOV" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Sami reindeer herder Nils Mathis Sara, 60, takes a rest inside a small cabin near Lake Iesjavri, in the Finnmark Plateau, Norway, June 15, 2018. REUTERS/Stoyan Nenov SEARCH "ARCTIC NENOV" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A boat is moored on the shores of Repparfjord, Norway, June 13, 2018. REUTERS/Stoyan Nenov SEARCH "ARCTIC NENOV" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A view of the hills from Repparfjord, Norway, June 13, 2018. REUTERS/Stoyan Nenov SEARCH "ARCTIC NENOV" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A view from the boat of sea Sami fisherman Tommy Pettersen, 47, as he fishes for king crabs in Repparfjord, Norway, June 13, 2018. REUTERS/Stoyan Nenov SEARCH "ARCTIC NENOV" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Sea Sami fisherman, Einar Juliussen, 54, fishes for king crabs in Repparfjord, Norway, June 13, 2018. REUTERS/Stoyan Nenov SEARCH "ARCTIC NENOV" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Sea Sami fisherman Einar Juliussen, 54, holds a king crab on a boat in Repparfjord, Norway, June 13, 2018. REUTERS/Stoyan Nenov SEARCH "ARCTIC NENOV" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.