A man dispenses fertiliser in a rice field, near Zanzibar City, on the island of Zanzibar, Tanzania, October 31, 2019. Picture taken October 31, 2019. REUTERS/Baz Ratner

Farmer Muhammad Rasman, 51, collects ashes from peatland and trees burned next to his farmland for fertiliser at Sebangau district in Palangka Raya, Central Kalimantan province, Indonesia, September 19, 2019. REUTERS/Willy Kurniawan SEARCH "KURNIAWAN RAYA" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Farmer Muhammad Rasman, 51, collects the ashes from peatland and trees burned next to his farmland for fertiliser at Sebangau district in Palangka Raya, Central Kalimantan province, Indonesia, September 19, 2019. REUTERS/Willy Kurniawan SEARCH "KURNIAWAN RAYA" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A detailed view of camel feces at the animal waste transfer station in Adhen Village, Ras al Khaimah, United Arab Emirates July 16, 2019. Picture taken July 16, 2019. REUTERS/Christopher Pike

Austrian plastics and fertiliser maker Borealis Chief Executive Alfred Stern gestures during an interview with Reuters in Vienna, Austria May 13, 2019. REUTERS/Leonhard Foeger

Austrian plastics and fertiliser maker Borealis Chief Executive Alfred Stern gestures during an interview with Reuters in Vienna, Austria May 13, 2019. REUTERS/Leonhard Foeger

Austrian plastics and fertiliser maker Borealis Chief Executive Alfred Stern looks on during an interview with Reuters in Vienna, Austria May 13, 2019. REUTERS/Leonhard Foeger

Austrian plastics and fertiliser maker Borealis Chief Executive Alfred Stern gestures during an interview with Reuters in Vienna, Austria May 13, 2019. REUTERS/Leonhard Foeger

Austrian plastics and fertiliser maker Borealis Chief Executive Alfred Stern gestures during an interview with Reuters in Vienna, Austria May 13, 2019. REUTERS/Leonhard Foeger

Austrian plastics and fertiliser maker Borealis Chief Executive Alfred Stern gestures during an interview with Reuters in Vienna, Austria May 13, 2019. REUTERS/Leonhard Foeger

Austrian plastics and fertiliser maker Borealis Chief Executive Alfred Stern gestures during an interview with Reuters in Vienna, Austria May 13, 2019. REUTERS/Leonhard Foeger

Austrian plastics and fertiliser maker Borealis Chief Executive Alfred Stern looks on during an interview with Reuters in Vienna, Austria May 13, 2019. REUTERS/Leonhard Foeger

Dmitry Mazepin, majority owner of Russia's fertiliser group Uralchem, and tycoon Andrei Melnichenko attend a session during the Week of Russian Business, organised by the Russian Union of Industrialists and Entrepreneurs (RSPP), in Moscow, Russia March 14, 2019. REUTERS/Maxim Shemetov

Dmitry Mazepin, majority owner of Russia's fertiliser group Uralchem, attends a session during the Week of Russian Business, organised by the Russian Union of Industrialists and Entrepreneurs (RSPP) in Moscow, Russia March 14, 2019. REUTERS/Maxim Shemetov

Heads turn when An Hui and Ye Jianbin walk down a street in the Chinese city of Shenzhen with their triplets, who were conceived with help from a human egg donor and a surrogate mother. People are mostly curious about their unconventional family, said An, adding that it was not always the case in China where gay couples have long battled conservative Confucian values. The two men wanted a family and began exploring the option of in vitro fertilisation (IVF), with help from a human egg donor and a surrogate mother. In 2014, a Thai woman gave birth in Hong Kong to three boys Ð An Zhizhong, An Zhiya and An Zhifei - who were conceived using human eggs provided by a German fashion model, according to An. REUTERS/Jason Lee SEARCH "LGBT TRIPLETS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY. Matching text: CHINA-LGBT/CHILDREN

A man makes a "caganer", or defecator, depicting former Catalan president Carles Puigdemont with a mould in a pottery in Torroella de Montgri, near Girona, Spain, December 14, 2018. Catalans hide "caganers", which symbolise defecation and fertilisation of the earth, and are believed to bring prosperity and luck for the coming year, in Christmas Nativity scenes to let friends hunt for them during Christmas celebrations. Picture taken December 14, 2018. REUTERS/Albert Gea

People look at clay "caganers" figures at the Santa Llucia Christmas market in central Barcelona, Spain, December 14, 2018. Catalans hide "caganers", which symbolise defecation and fertilisation of the earth, and are believed to bring prosperity and luck for the coming year, in Christmas Nativity scenes to let friends hunt for them during Christmas celebrations. Picture taken December 14, 2018. REUTERS/Albert Gea

Clay "caganers" figures representing a yellow ribbon (the symbol used to demand the release of jailed Catalonian politicians) is sold at the Santa Llucia Christmas market in central Barcelona, Spain, December 14, 2018. Catalans hide "caganers", which symbolise defecation and fertilisation of the earth, and are believed to bring prosperity and luck for the coming year, in Christmas Nativity scenes to let friends hunt for them during Christmas celebrations. Picture taken December 14, 2018. REUTERS/Albert Gea

Clay "caganers" figures representing U.S. President Donald Trump, Russian President Vladimir Putin, North Korean leader Kim Jong Un, British Prime Minister Theresa May, Chinese President Xi Jinping, German Chancellor Angela Merkel, Queen Elizabeth II, French President Emmanuel Macron, and Spanish Prime Minister Pedro Sanchez are displayed at the Santa Llucia Christmas market in central Barcelona, Spain, December 14, 2018. Catalans hide "caganers", which symbolise defecation and fertilisation of the earth, and are believed to bring prosperity and luck for the coming year, in Christmas Nativity scenes to let friends hunt for them during Christmas celebrations. Picture taken December 14, 2018. REUTERS/Albert Gea

Clay "caganers" figures representing Catalan, Spanish and international politicians are displayed at the Santa Llucia Christmas market in central Barcelona, Spain, December 14, 2018. Catalans hide "caganers", which symbolise defecation and fertilisation of the earth, and are believed to bring prosperity and luck for the coming year, in Christmas Nativity scenes to let friends hunt for them during Christmas celebrations. Picture taken December 14, 2018. REUTERS/Albert Gea

A boy points at clay "caganers" figures at the Santa Llucia Christmas market in central Barcelona, Spain, December 14, 2018. Catalans hide "caganers", which symbolise defecation and fertilisation of the earth, and are believed to bring prosperity and luck for the coming year, in Christmas Nativity scenes to let friends hunt for them during Christmas celebrations. Picture taken December 14, 2018. REUTERS/Albert Gea

Clay "caganers" figures representing French President Emmanuel Macron, German Chancellor Angela Merkel, British Prime Minister Theresa May and Russian President Vladimir Putin are displayed at the Santa Llucia Christmas market in central Barcelona, Spain, December 14, 2018. Catalans hide "caganers", which symbolise defecation and fertilisation of the earth, and are believed to bring prosperity and luck for the coming year, in Christmas Nativity scenes to let friends hunt for them during Christmas celebrations. Picture taken December 14, 2018. REUTERS/Albert Gea

Clay "caganers" figures are displayed at the Santa Llucia Christmas market in central Barcelona, Spain, December 14, 2018. Catalans hide "caganers", which symbolise defecation and fertilisation of the earth, and are believed to bring prosperity and luck for the coming year, in Christmas Nativity scenes to let friends hunt for them during Christmas celebrations. Picture taken December 14, 2018. REUTERS/Albert Gea

Clay "caganers" figures representing FC Barcelona's players Lionel Messi, Sergi Roberto and Luis Suarez are displayed at the Santa Llucia Christmas market in central Barcelona, Spain, December 14, 2018. Catalans hide "caganers", which symbolise defecation and fertilisation of the earth, and are believed to bring prosperity and luck for the coming year, in Christmas Nativity scenes to let friends hunt for them during Christmas celebrations. Picture taken December 14, 2018. REUTERS/Albert Gea

Clay "caganers" figures representing Catalan and Spanish politicians and Spanish Royal family are displayed at the Santa Llucia Christmas market in central Barcelona, Spain, December 14, 2018. Catalans hide "caganers", which symbolise defecation and fertilisation of the earth, and are believed to bring prosperity and luck for the coming year, in Christmas Nativity scenes to let friends hunt for them during Christmas celebrations. Picture taken December 14, 2018. REUTERS/Albert Gea

Clay "caganers" figures representing international politicians and soccer players are sold at the Santa Llucia Christmas market in central Barcelona, Spain, December 14, 2018. Catalans hide "caganers", which symbolise defecation and fertilisation of the earth, and are believed to bring prosperity and luck for the coming year, in Christmas Nativity scenes to let friends hunt for them during Christmas celebrations. Picture taken December 14, 2018. REUTERS/Albert Gea

A man makes a "caganer", or defecator, depicting former Catalan president Carles Puigdemont with a mould, in a pottery in Torroella de Montgri, near Girona, Spain, December 14, 2018. Catalans hide "caganers", which symbolise defecation and fertilisation of the earth, and are believed to bring prosperity and luck for the coming year, in Christmas Nativity scenes to let friends hunt for them during Christmas celebrations. Picture taken December 14, 2018. REUTERS/Albert Gea

A man paints a "caganer", or defecator, depicting British Prime Minister Theresa May in a pottery in Torroella de Montgri, near Girona, Spain, December 14, 2018. Catalans hide "caganers", which symbolise defecation and fertilisation of the earth, and are believed to bring prosperity and luck for the coming year, in Christmas Nativity scenes to let friends hunt for them during Christmas celebrations. Picture taken December 14, 2018. REUTERS/Albert Gea

Dr Dyllon Randall holds a bio-brick made from urine at the University of Cape Town, in Cape Town, South Africa November 2, 2018. The odourless, grey prototype brick was grown in a mould in the lab over eight days and is the final product in a process that also produces fertilisers. REUTERS/Mike Hutchings

Researchers Dr Dyllon Randall, Suzanne Lambert and Vukheta Mukhari stand with a bio-brick made from urine at the University of Cape Town, in Cape Town, South Africa November 2, 2018. The odourless, grey prototype brick was grown in a mould in the lab over eight days and is the final product in a process that also produces fertilisers. REUTERS/Mike Hutchings

Amandine Giraud and her wife Laurene Corral pose with their children Makenzy and Leandre conceived with fertility assistance during an interview with Reuters in Paris, France, September 25, 2018. France's highest bioethics body announced that Lesbian couples and single women who want to bear children should have access to medically assisted reproduction treatments such as in-vitro fertilisation. REUTERS/Christian Hartmann

Amandine Giraud and her wife Laurene Corral pose with their children Makenzy and Leandre conceived with fertility assistance during an interview with Reuters in Paris, France, September 25, 2018. France's highest bioethics body announced that Lesbian couples and single women who want to bear children should have access to medically assisted reproduction treatments such as in-vitro fertilisation. REUTERS/Christian Hartmann

Amandine Giraud and her wife Laurene Corral pose with their children Makenzy and Leandre conceived with fertility assistance during an interview with Reuters in Paris, France, September 25, 2018. France's highest bioethics body announced that Lesbian couples and single women who want to bear children should have access to medically assisted reproduction treatments such as in-vitro fertilisation. REUTERS/Christian Hartmann

The logo of fertiliser maker Notore Chemical Industries Plc is pictured in Abuja, Nigeria August 2, 2018. REUTERS/Afolabi Sotunde

A fertilising mechanism fertilises soybean fields in Gideon, Missouri, U.S., May 16, 2018. Picture taken May 16, 2018. REUTERS/Shannon Stapleton

A digital screen shows the direction for fertilising Gideon, Missouri, U.S., May 16, 2018. Picture taken May 16, 2018. REUTERS/Shannon Stapleton

Farmer Blake Davis, 32, fertilises a soybean field in Gideon, Missouri, U.S., May 16, 2018. Picture taken May 16, 2018. REUTERS/Shannon Stapleton

A fertilising unit is seen in a mirror fertilising soybean fields in Gideon, Missouri, U.S., May 16, 2018. Picture taken May 16, 2018. REUTERS/Shannon Stapleton

A tractor fertilises the ground outside Sikeston, Missouri, U.S., May 16, 2018. Picture taken May 16, 2018. REUTERS/Shannon Stapleton

The front of a tractor is seen on the path for fertilising in Gideon, Missouri, U.S., May 16, 2018. Picture taken May 16, 2018. REUTERS/Shannon Stapleton

A fertilising sprayer sprays corn fields outside New Madrid, Missouri, U.S., May 17, 2018. Picture taken May 17, 2018. REUTERS/Shannon Stapleton

A fertilising vehicle makes its way across crops outside Gideon, Missouri, U.S., May 17, 2018. Picture taken May 17, 2018. REUTERS/Shannon Stapleton

Farmer Blake Davis, 32, works on his fertiliser sprayer in Gideon, Missouri, U.S., May 17, 2018. Picture taken May 17, 2018. REUTERS/Shannon Stapleton

A U.S. flag is seen outside a fertilising sprayer in Gideon, Missouri, U.S., May 17, 2018. Picture taken May 17, 2018. REUTERS/Shannon Stapleton

A fertilising vehicle makes its way over a bridge outside Gideon, Missouri, U.S., May 17, 2018. Picture taken May 17, 2018. REUTERS/Shannon Stapleton

Farmers fill tanks with fertiliser in Gideon Missouri, U.S., May 17, 2018. Picture taken May 17, 2018. REUTERS/Shannon Stapleton

A man carries a bag of fertiliser as he walks past an OK grocery store in Harare, Zimbabwe, November 27, 2017. REUTERS/Siphiwe Sibeko

A farmer holds black soldier fly larvae in their pupae stage right before they hatch into flies in Singapore June 20, 2017. The flies eat food waste and produce fertiliser for the urban farm. Picture taken June 20, 2017. REUTERS/Thomas White

The logo of Russian fertiliser maker Uralchem is seen on a board at the St. Petersburg International Economic Forum 2017 (SPIEF 2017) in St. Petersburg, Russia, June 1, 2017. Picture taken June 1, 2017. REUTERS/Sergei Karpukhin

A general view shows Odessa Portside Plant (OPP), which is one of Ukraine's largest nitrogen fertilizer producers, outside Odessa, Ukraine, September 16, 2016. REUTERS/Valentyn Ogirenko/File Photo

A general view shows Odessa Portside Plant (OPP), which is one of Ukraine's largest nitrogen fertilizer producers, outside Odessa, Ukraine, September 16, 2016. REUTERS/Valentyn Ogirenko/File Photo

A general view shows Odessa Portside Plant (OPP), which is one of Ukraine's largest nitrogen fertilizer producers, outside Odessa, Ukraine, September 16, 2016. REUTERS/Valentyn Ogirenko/File Photo

Belgian scientists Marjolein Vanoppen and Sebastiaan Derese demonstrate the use of a machine that turns urine into drinkable water and fertilizer using solar energy, at the University of Ghent, Belgium, July 26, 2016. REUTERS/Francois Lenoir

Belgian scientists Marjolein Vanoppen and Sebastiaan Derese (R) demonstrate the use of a machine that turns urine into drinkable water and fertilizer using solar energy, at the University of Ghent, Belgium, July 26, 2016. REUTERS/Francois Lenoir TPX IMAGES OF THE DAY

The logo of Russian fertiliser firm Uralchem is pictured at the company's stand during the St. Petersburg International Economic Forum 2016 (SPIEF 2016) in St. Petersburg, Russia, June 16, 2016. REUTERS/Sergei Karpukhin

Workers unload sacks of rotten rice as military personnel and government officers observe at a fertiliser warehouse in Ratchaburi province, Thailand, February 15, 2016. REUTERS/Athit Perawongmetha

A worker sweeps rotten rice at a fertilizer warehouse in Ratchaburi province, Thailand, February 15, 2016. REUTERS/Athit Perawongmetha

Rain clouds loom as Malawian subsistence farmer Louise Abele carries maize she has bought to feed her family near the capital Lilongwe, Malawi January 31, 2016. Floods and an El Nino-triggered drought have hit the staple maize crop, exposing the fragility of Malawi's progress, which was partly rooted in a fertiliser grant for small-scale farmers that the government, now starved of donor funds, can ill afford. Picture taken January 31, 2016. To match Insight AFRICA-DROUGHT/MALAWI. REUTERS/Mike Hutchings

Subsistence farmer Salome Banda stands beside bags of her maize stacked in a warehouse north of Lilongwe, Malawi February 2, 2016. Floods and an El Nino-triggered drought have hit the staple maize crop, exposing the fragility of Malawi's progress, which was partly rooted in a fertiliser grant for small-scale farmers that the government, now starved of donor funds, can ill afford. Picture taken February 2, 2016. Picture taken with fish-eye lens. To match Insight AFRICA-DROUGHT/MALAWI. REUTERS/Mike Hutchings

Subsistence farmer work their field of maize after late rains near the capital Lilongwe, Malawi February 1, 2016. Floods and an El Nino-triggered drought have hit the staple maize crop, exposing the fragility of Malawi's progress, which was partly rooted in a fertiliser grant for small-scale farmers that the government, now starved of donor funds, can ill afford. Picture taken February 1, 2016. Picture taken with fish-eye lens. To match Insight AFRICA-DROUGHT/MALAWI. REUTERS/Mike Hutchings