A dead cow lies on the bank of swollen Bishnumati River after the heavy rainfall in Kathmandu, Nepal, September 6, 2021. REUTERS/Navesh Chitrakar TPX IMAGES OF THE DAY

A dead cow lies on the bank of swollen Bishnumati River after the heavy rainfall in Kathmandu, Nepal, September 6, 2021. REUTERS/Navesh Chitrakar

JR Bubicki, with the U.S. Geological Survey (USGS), uses a boat with sensors in the Hockanum River, swollen from the rains from Tropical Storm Henri, to measure the flow rate in East Hartford, Connecticut, U.S., August 23, 2021. REUTERS/Brian Snyder

Dee-Ann McCarthy, with the U.S. Geological Survey (USGS), puts a boat with sensors in the Hockanum River, swollen from the rains from Tropical Storm Henri, to measure the flow rate in East Hartford, Connecticut, U.S., August 23, 2021. REUTERS/Brian Snyder

JR Bubicki, with the U.S. Geological Survey (USGS), uses a boat with sensors in the Hockanum River, swollen from the rains from Tropical Storm Henri, to measure the flow rate in East Hartford, Connecticut, U.S., August 23, 2021. REUTERS/Brian Snyder

Tokyo 2020 Olympics - Soccer Football - Men - Group C - Egypt v Spain - Sapporo Dome, Sapporo, Japan - July 22, 2021. The swollen ankle of Dani Ceballos of Spain is seen as he is substituted off after sustaining an injury REUTERS/Kim Hong-Ji

The swollen Sihl River is seen after torrential rain in Sihlbrugg, Switzerland July 14, 2021. REUTERS/Arnd Wiegmann

The swollen Reuss River is seen after heavy rainfall, next to the old town of Bremgarten, Switzerland July 9, 2021. Picture taken with a drone. REUTERS/Arnd Wiegmann

A view shows swollen river waters as hurricane Elsa passes near to Kingstown, Saint Vincent and the Grenadines, July 2, 2021. REUTERS/Robertson S. Henry

A window of a partially submerged house is seen as flood water from the swollen Melamchi river enters the village in Sindhupalchok, Nepal, June 16, 2021. REUTERS/Navesh Chitrakar

People stand on the roof of a house as flood water from the swollen Melamchi river enters the village in Sindhupalchok, Nepal June 16, 2021. REUTERS/Navesh Chitrakar

A Nepali army helicopter hovers above houses during a rescue mission as flood water from the swollen Melamchi river enters the village in Sindhupalchok, Nepal, June 16, 2021. REUTERS/Navesh Chitrakar

A Nepali army helicopter flies above the swollen Melamchi river during a rescue mission in Sindhupalchok, Nepal, June 16, 2021. REUTERS/Navesh Chitrakar

Partially submerged houses are seen as flood water from the swollen Melamchi river enters the village in Sindhupalchok, Nepal, June 16, 2021. REUTERS/Navesh Chitrakar

Partially submerged houses are seen as flood water from the swollen Melamchi river enters the village in Sindhupalchok, Nepal, June 16, 2021. REUTERS/Navesh Chitrakar

People gather on higher ground as flood water from the swollen Melamchi river enters the village in Sindhupalchok, Nepal, June 16, 2021. REUTERS/Navesh Chitrakar

People gather on higher ground as flood water from the swollen Melamchi river enters the village in Sindhupalchok, Nepal, June 16, 2021. REUTERS/Navesh Chitrakar

People sit on a hilltop as they look towards the swollen Melamchi river in Sindhupalchok, Nepal, June 16, 2021. REUTERS/Navesh Chitrakar

Long COVID sufferer Susana Matarranz, a 44-year-old primary school teacher, poses for a photograph taken through blue plastic, in Madrid, Spain, March 8, 2021. The photograph was taken through blue plastic to visualise the effects of long COVID. Matarranz gets emotional when she explains how much she misses her students. Matarranz got infected on March 1, 2020. At first, she only noticed the loss of smell and taste, but soon afterwards she started suffering from severe stomach problems and acute joint pain. "My right collar bone is swollen, I can barely lift my arm, I feel like I have aged prematurely," she said. Matarranz returned to work in September, but got infected a second time in November and hasn't been able to continue teaching ever since. "The part of me that is my profession is empty, like that blackboard. A piece of my heart, which are my students, whom I love dearly, feels empty and I feel like at this moment there's nothing I can do to fill it in." REUTERS/Susana Vera SEARCH "SPAIN LONGCOVID" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY.

A blank children's blackboard is photographed through blue plastic at the home of long COVID sufferer Susana Matarranz, a 44-year-old primary school teacher, in Madrid, Spain, March 8, 2021. The photograph was taken through blue plastic to visualise the effects of long COVID. Matarranz gets emotional when she explains how much she misses her students. Matarranz got infected on March 1, 2020. At first, she only noticed the loss of smell and taste, but soon afterwards she started suffering from severe stomach problems and acute joint pain. "My right collar bone is swollen, I can barely lift my arm, I feel like I have aged prematurely," she said. Matarranz returned to work in September, but got infected a second time in November and hasn't been able to continue teaching ever since. "The part of me that is my profession is empty, like that blackboard. A piece of my heart, which are my students, whom I love dearly, feels empty and I feel like at this moment there's nothing I can do to fill it in." REUTERS/Susana Vera SEARCH "SPAIN LONGCOVID" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

A combination picture shows long COVID sufferer Susana Matarranz, a 44-year-old primary school teacher, posing for a photograph taken through blue plastic, and a blank blackboard photographed through blue plastic at Matarranz's home, in Madrid, Spain, March 8, 2021. The photographs were taken through blue plastic to visualise the effects of long COVID. Matarranz gets emotional when she explains how much she misses her students. Matarranz got infected on March 1, 2020. At first, she only noticed the loss of smell and taste, but soon afterwards she started suffering from severe stomach problems and acute joint pain. "My right collar bone is swollen, I can barely lift my arm, I feel like I have aged prematurely," she said. Matarranz returned to work in September, but got infected a second time in November and hasn't been able to continue teaching ever since. "The part of me that is my profession is empty, like that blackboard. A piece of my heart, which are my students, whom I love dearly, feels empty and I feel like at this moment there's nothing I can do to fill it in." REUTERS/Susana Vera SEARCH "SPAIN LONGCOVID" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY.

A boat navigates the swollen Hawkesbury River northwest of Sydney as flooding resulting from a severe weather event with prolonged rains affects the area in Wisemans Ferry, Australia, March 25, 2021. REUTERS/Loren Elliott

A boat navigates the swollen Hawkesbury River northwest of Sydney as flooding resulting from a severe weather event with prolonged rains affects the area in Wisemans Ferry, Australia, March 25, 2021. REUTERS/Loren Elliott

A boat navigates the swollen Hawkesbury River northwest of Sydney as flooding resulting from a severe weather event with prolonged rains affects the area in Wisemans Ferry, Australia, March 25, 2021. REUTERS/Loren Elliott

A view of the swollen Colo River, as the state of New South Wales experiences widespread flooding following days of severe weather, in northwestern Sydney, Australia, March 24, 2021. Picture taken with a drone. REUTERS/Jill Gralow

A view of the swollen Colo River, as the state of New South Wales experiences widespread flooding following days of severe weather, in northwestern Sydney, Australia, March 24, 2021. Picture taken with a drone. REUTERS/Jill Gralow

People look out at the swollen Hawkesbury River from the deck of a partially submerged house as floodwaters rise in western Sydney, Australia, March 23, 2021. REUTERS/Loren Elliott/Pool

The Australian national flag pokes out of the swollen Hawkesbury River as the state of New South Wales experiences severe flooding, in the suburb of Sackville North in Sydney, Australia, March 23, 2021. REUTERS/Loren Elliott

A man wades through floodwaters on a residential street near the swollen Nepean River as the state of New South Wales experiences widespread flooding and severe weather, in Sydney, Australia, March 21, 2021. REUTERS/Loren Elliott

A person crosses a bridge over the swollen Nepean River as the state of New South Wales experiences widespread flooding and severe weather, in Sydney, Australia, March 21, 2021. REUTERS/Loren Elliott

A person wades through floodwaters near the swollen Nepean River as the state of New South Wales experiences widespread flooding and severe weather, in Sydney, Australia, March 21, 2021. REUTERS/Loren Elliott

A man smokes a cigarette next to the swollen Nepean River as the state of New South Wales experiences widespread flooding and severe weather, in Sydney, Australia, March 21, 2021. REUTERS/Loren Elliott

A person wades through floodwaters near the swollen Nepean River as the state of New South Wales experiences widespread flooding and severe weather, in Sydney, Australia, March 21, 2021. REUTERS/Loren Elliott

A man wades through floodwaters on a residential street near the swollen Nepean River as the state of New South Wales experiences widespread flooding and severe weather, in Sydney, Australia, March 21, 2021. REUTERS/Loren Elliott

A child wades through floodwaters on a residential street near the swollen Nepean River as the state of New South Wales experiences widespread flooding and severe weather, in Sydney, Australia, March 21, 2021. REUTERS/Loren Elliott

People gather on a flooded residential street near the swollen Nepean River as the state of New South Wales experiences widespread flooding and severe weather, in Sydney, Australia, March 21, 2021. REUTERS/Loren Elliott TPX IMAGES OF THE DAY

A man wades through floodwaters on a residential street near the swollen Nepean River as the state of New South Wales experiences widespread flooding and severe weather, in Sydney, Australia, March 21, 2021. REUTERS/Loren Elliott

People gather on a flooded path near the swollen Nepean River as the state of New South Wales experiences widespread flooding and severe weather, in Sydney, Australia, March 21, 2021. REUTERS/Loren Elliott

Houses are seen along the swollen Nepean River as the state of New South Wales experiences widespread flooding and severe weather, in Sydney, Australia, March 21, 2021. REUTERS/Loren Elliott

People walk past floodwaters near the swollen Nepean River as the state of New South Wales experiences widespread flooding and severe weather, in Sydney, Australia, March 21, 2021. REUTERS/Loren Elliott

A sign is partially submerged on a residential path near the swollen Nepean River as the state of New South Wales experiences widespread flooding and severe weather, in Sydney, Australia, March 21, 2021. REUTERS/Loren Elliott

People view swollen Parramatta River at Parramatta Wharf as the state of New South Wales experiences heavy rains, in Sydney, Australia, March 20, 2021. REUTERS/Jaimi Joy

The swollen Parramatta River as the state of New South Wales experiences heavy rains, in Sydney, Australia, March 20, 2021. REUTERS/Jaimi Joy

People view the swollen Parramatta River as the state of New South Wales experiences heavy rains, in Sydney, Australia, March 20, 2021. REUTERS/Jaimi Joy

People walk past the swollen Parramatta River as the state of New South Wales experiences heavy rains, in Sydney, Australia, March 20, 2021. REUTERS/Jaimi Joy

A view of Parramatta Wharf at the swollen Parramatta River as the state of New South Wales experiences heavy rains, in Sydney, Australia, March 20, 2021. REUTERS/Jaimi Joy

A park bench at the swollen Parramatta River as the state of New South Wales experiences heavy rains, in Sydney, Australia, March 20, 2021. REUTERS/Jaimi Joy

A woman stands on a park bench at the swollen Parramatta River as the state of New South Wales experiences heavy rains, in Sydney, Australia, March 20, 2021. REUTERS/Jaimi Joy

SES tape blocking access to the path to the swollen Parramatta River as the state of New South Wales experiences heavy rains, in Sydney, Australia, March 20, 2021. REUTERS/Jaimi Joy

A woman walks past the swollen Parramatta River as the state of New South Wales experiences heavy rains, in Sydney, Australia, March 20, 2021. REUTERS/Jaimi Joy

The swollen Parramatta River as the state of New South Wales experiences heavy rains, in Sydney, Australia, March 20, 2021. REUTERS/Jaimi Joy

People walk past the swollen Parramatta River as the state of New South Wales experiences heavy rains, in Sydney, Australia, March 20, 2021. REUTERS/Jaimi Joy

People view the swollen Parramatta River from Parramatta wharf as the state of New South Wales experiences heavy rains, in Sydney, Australia, March 20, 2021. REUTERS/Jaimi Joy

FILE PHOTO: An aerial view shows workers collecting plastic trash that litters the polluted Potpecko Lake near a dam's hydroelectric plant near the town of Priboj, Serbia, January 29, 2021. Two barges sailed up and down a vast stretch of floating trash on the Potpecko artificial lake in Serbia, collecting tons of garbage that almost clogged the dam that crosses it. The river Lim which fills the lake is swollen by melting snows, and according to activists, it has carried in more than 20,000 cubic meters of plastics from unregulated dumps along its banks in Serbia, Montenegro and Bosnia. As the garbage also threatened the functioning of a hydroelectric plant, authorities in Belgrade ordered an immediate clean-up. The operators collect up to 100 cubic meters of plastic and other trash daily and take it to a landfill about 80 km (50 miles) away. Picture taken with a drone. REUTERS/Marko Djurica/File photo SEARCH "GLOBAL WATER" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

A horse is ridden on a bridge over the swollen River Avon in the aftermath of Storm Christoph, near Chippenham, Britain, January 22, 2021. REUTERS/Toby Melville

Horses are ridden on a bridge over the swollen River Avon in the aftermath of Storm Christoph, near Chippenham, Britain, January 22, 2021. REUTERS/Toby Melville

Boats are anchored outside a submerged shop after the water levels at Lake Naivasha bulged to record high, pushing hundreds of people from surrounding farms around Naivasha town within Nakuru county, Kenya November 8, 2020. Picture taken November 8, 2020. REUTERS/Monicah Mwangi

Residents secure fittings from their submerged houses after the water levels at Lake Naivasha bulged to record high, pushing hundreds of people from surrounding farms around Naivasha town within Nakuru county, Kenya November 8, 2020. Picture taken November 8, 2020. REUTERS/Monicah Mwangi

Residents wade through flood waters after the levels at Lake Naivasha bulged to record high, pushing hundreds of people from surrounding farms around Naivasha town within Nakuru county, Kenya November 8, 2020. Picture taken November 8, 2020. REUTERS/Monicah Mwangi

Residents wade through flood waters near their submerged houses after the water levels at Lake Naivasha bulged to record high, pushing hundreds of people from surrounding farms around Naivasha town within Nakuru county, Kenya November 8, 2020. Picture taken November 8, 2020. REUTERS/Monicah Mwangi