The largest contributor to the global refugee crisis is warfare. According to the United Nations High Commissioner for Refugees (UNHCR), there were 89.3 million forcibly displaced people worldwide in 2021, of whom 27.1 million were refugees. The majority of these refugees were fleeing conflict and violence.

The following are some of the most recent and ongoing conflicts that have contributed to the global refugee crisis:

* The Syrian Civil War, which has been ongoing since 2011, has displaced millions of people within Syria and forced millions more to flee to neighboring countries.
* The Yemeni Civil War, which has been ongoing since 2014, has created the world's worst humanitarian crisis, with millions of people displaced and in need of assistance.
* The Rohingya Crisis in Myanmar, which began in 2017, has forced over 700,000 Rohingya Muslims to flee to Bangladesh.
* The Afghanistan War, which lasted from 2001 to 2021, displaced millions of Afghans and forced many to flee the country.

The global refugee crisis is a complex and challenging problem. There is no easy solution, but there are a number of things that can be done to address the issue. These include:

* Providing humanitarian assistance to refugees and displaced people.
* Supporting efforts to resolve conflicts and build peace.
* Investing in development in countries that are most affected by conflict and displacement.
* Raising awareness of the refugee crisis and advocating for solutions.

By working together, we can help to address the global refugee crisis and build a more just and equitable world for all.
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