The report said an estimated 50 million people were "living in situations of modern slavery" in 2021, an increase of 10 million over 2016, when the problem was last measured.

The figure includes some 28 million people in forced labor and 22 million living in a forced marriage.

The situation is worsening "against a backdrop of increasing and more complex armed conflicts, widespread environmental degradation" and impacts from the coronavirus pandemic, among other factors, the investigation said.

Compiled by the human rights charity Walk Free, the report defines modern slavery as encompassing "forced labor, forced or servile marriage, debt bondage, forced commercial sexual exploitation, human trafficking, slavery-like practices and the sale and exploitation of children."

Slavery's core principle entails "the systematic removal of a person’s freedom"— from the right to accept or refuse labor to the liberty to determine if, when and whom to marry.

By this benchmark, reclusive and authoritarian North Korea has the highest prevalence of modern slavery (104.6 per 1,000 population), according to the report.

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