Thomson Reuters Foundation

Years of conflict and climate disasters have pushed millions of children into work, the United Nations said on Tuesday.

In 2017, there were 152 million children under the age of 18 working around the world, the International Labour Organization said in a report marking World Day Against Child Labour.

The vast majority work in farming, and their numbers are rising, according to a statement from the UN Food and Agriculture Organization.

"After years of steady decline, child labour in agriculture has started to rise again in recent years, driven in part by an increase in conflicts and climate-induced disasters," it said.

"This worrisome trend not only threatens the wellbeing of millions of children, but also undermines efforts to end global hunger and poverty."

The UN aims to end all forms of child labour by 2025.

Here are some more facts about child labour:

• Almost half of all child labour happens in Africa, where about 72 million children work.

• The prevalence of child labour is 77 per cent higher in countries where there is conflict.

• Almost half of all working labourers work in dangerous industries such as construction, agriculture, mining and brick and stone manufacturing.

• The number of children working in agriculture increased from 98 million in 2012 to 108 million in 2017.

•  Children working in farms, fields, mines, homes and factories can be exposed to toxic pesticides, forced to carry heavy loads, and made to work long hours.