Modern slavery is a growing challenge thanks to a mix of armed conflict, climate change and the global pandemic, says a new UN report.
International Labor Organization estimates suggest that 50 million people, or one in every 150, are in forced labor or marriage.
That's nearly 10 million more than five years ago.
The ILO said the fact that things were getting worse was "shocking". "Nothing can justify the continuation of this fundamental abuse of human rights," said its director-general, Guy Ryder.
"We know what needs to be done... a comprehensive approach is needed. Trade unions, employers' organisations, civil society and ordinary people all have critical roles to play," he continued.
The UN labor organization emphasizes that slavery is not limited to poor countries far from the Western world, more than half of all forced labor occurs in wealthier countries in the middle or high income group.
Both forced labor and forced marriage count as modern slavery - both situations where the person cannot leave "due to threats, violence, fraud, abuse of power or other forms of coercion".
"The trap in forced labor can last for years, while in most cases forced marriage is a life sentence," the report states.
An estimated 27.6 million people are in forced labor, including 3.3 million children. Of these children, more than half are sexually exploited.
Another 22 million people are in forced marriages, more than two-thirds of them women, and many victims are under 15 when the marriage takes place.
That things are getting worse is the result of a complex mix of "complex crises," the report says, all of which combine to increase poverty and increase the risk of enslavement.
The Covid-19 pandemic, for example, caused major disruptions to people's incomes, leading to more debt, which could be used in forced labor in some cases. The ILO says the pandemic has led to an increase in "extreme global poverty" for the first time in 20 years.
War and armed conflict also lead to dire circumstances, or the recruitment of children to work, or to serve as child soldiers; while climate change has forced people to leave their homes and become migrants, putting them immediately at greater risk.
The report calls for an international effort to pool resources. "Promises and declarations of good intentions are not enough," the report warns.