Justin Trudeau will address the UN General Assembly on Tuesday, delivering his maiden speech as Canadian prime minister at the high-level diplomatic forum that had an acrimonious relationship with this country's previous government.[...] "With Trudeau, they're trying to re-engage," [...] "They're saying Canada is back in the world."

World leaders meeting at the United Nations starting on Monday will try to make progress on two intractable problems at the top of the global agenda — the biggest refugee crisis since World War II and the Syrian conflict now in its sixth year, which has claimed over 300,000 lives.

On Sept. 15, film star and environmental activist Leonardo DiCaprio unveiled Global Fishing Watch for the public at the US State Department’s Our Ocean 2016 conference. [...] The goal? Get the public engaged in illegal fishing, which makes up 35 percent of the global wild marine catch, according to the UN Food and Agriculture Organization.

Global challenges that affect millions of citizens and nations must be examined collectively, inclusively and jointly. The large influx of migrants does not represent a single isolated issue that can be easily dealt with, but rather demands greater efforts. The United Nations can provide a more robust platform for addressing the migrant crisis. All nations together must participate in addressing and offering support to refugees and the host nations.

Refugees can be an economic boost, not burden, to the communities that host them, a new study by the United Nations concludes. The benefit is bigger if refugees are given cash stipends instead of food rations, according to a joint project by the World Food Programme and researchers at the University of California Davis. The team studied Congolese refugees living in three different camps in Rwanda.

President Barack Obama and Chinese President Xi Jinping on Saturday joined a global agreement to cut greenhouse gases, moving the world toward a significant reduction in climate-warming emissions faster time frame than previously imagined.

On International Youth Day, which is celebrated annually on Aug. 12, UN Secretary-General Ban Ki-moon chose Palestinian youth Hussein Murtaja from Gaza City to be part of the Advisory Group of Experts for Progress Study on Youth, Peace and Security. [...] This group includes 21 youth experts who work in the framework of a project with the aim of finding a new role the youth can play in peace and security building.

Children like those in Zaatari, and millions of others around the world, are central to the work of the International Commission on Financing Global Education Opportunity, which I joined last September. This commission is committed to the fourth United Nations Sustainable Development Goal, which aims, by 2030, to “ensure inclusive and equitable quality education and promote lifelong learning opportunities for all.”