Children use buckets to clear muddy floodwater from a dyke in the village of Wang Chot, Old Fangak county, Jonglei state, South Sudan Thursday, Nov. 26, 2020. Some 1 million people in the country have been displaced or isolated for months by the worst flooding in memory, with the intense rainy season a sign of climate change. (AP Photo/Maura Ajak)

Thatched huts surrounded by floodwaters are seen from the air in Old Fangak county, Jonglei state, South Sudan Friday, Nov. 27, 2020. Some 1 million people in the country have been displaced or isolated for months by the worst flooding in memory, with the intense rainy season a sign of climate change. (AP Photo/Maura Ajak)

Nyankier, left, and her siblings look out at floodwaters surrounding the primary and nursery school where they are living in the village of Wang Chot, Old Fangak county, Jonglei state, South Sudan Thursday, Nov. 26, 2020. Some 1 million people in the country have been displaced or isolated for months by the worst flooding in memory, with the intense rainy season a sign of climate change. (AP Photo/Maura Ajak)

Thatched huts surrounded by floodwaters are seen from the air in Old Fangak county, Jonglei state, South Sudan Friday, Nov. 27, 2020. Some 1 million people in the country have been displaced or isolated for months by the worst flooding in memory, with the intense rainy season a sign of climate change. (AP Photo/Maura Ajak)

Thatched huts surrounded by floodwaters are seen from the air in Old Fangak county, Jonglei state, South Sudan Friday, Nov. 27, 2020. Some 1 million people in the country have been displaced or isolated for months by the worst flooding in memory, with the intense rainy season a sign of climate change. (AP Photo/Maura Ajak)

Thatched huts surrounded by floodwaters are seen from the air in Old Fangak county, Jonglei state, South Sudan Friday, Nov. 27, 2020. Some 1 million people in the country have been displaced or isolated for months by the worst flooding in memory, with the intense rainy season a sign of climate change. (AP Photo/Maura Ajak)

Thatched huts surrounded by floodwaters are seen from the air in Old Fangak county, Jonglei state, South Sudan Friday, Nov. 27, 2020. Some 1 million people in the country have been displaced or isolated for months by the worst flooding in memory, with the intense rainy season a sign of climate change. (AP Photo/Maura Ajak)

A mother holds her baby as she is transported by dugout canoe through floodwaters in the village of Wang Chot, Old Fangak county, Jonglei state, South Sudan Thursday, Nov. 26, 2020. Some 1 million people in the country have been displaced or isolated for months by the worst flooding in memory, with the intense rainy season a sign of climate change. (AP Photo/Maura Ajak)

Children wash themselves in muddy floodwaters in the village of Wang Chot, Old Fangak county, Jonglei state, South Sudan Thursday, Nov. 26, 2020. Some 1 million people in the country have been displaced or isolated for months by the worst flooding in memory, with the intense rainy season a sign of climate change. (AP Photo/Maura Ajak)

Mother of five Nyaduoth Kon, carries food in a bucket on her head as she wades through floodwaters in the village of Wang Chot, Old Fangak county, Jonglei state, South Sudan Thursday, Nov. 26, 2020. Some 1 million people in the country have been displaced or isolated for months by the worst flooding in memory, with the intense rainy season a sign of climate change. (AP Photo/Maura Ajak)

A father and his sons transport cows from a flooded area to drier ground using a dugout canoe, in Old Fangak county, Jonglei state, South Sudan Wednesday, Nov. 25, 2020. Some 1 million people in the country have been displaced or isolated for months by the worst flooding in memory, with the intense rainy season a sign of climate change. (AP Photo/Maura Ajak)