The 10 Most Critical Problems in the world, According to @Millennials :

A 16 foot high sculpture of a polar bear and cub, afloat on a small iceberg, passes in front of the Houses of Parliament on the River Thames on January 26, 2009 in London, England. The sculpture was launched to provide a warning to members of parliament of the dangers of climate change and to launch Eden, a new natural history television channel.
Despite the dire state of the world today — and the stereotype that millennials' are selfish and apathetic — the generation aged 18 to 35 cares deeply about global issues, and they're determined to tackle them.
In fact, 70% of millennials see plentiful opportunities for themselves and their peers, and 50% believe they can significantly contribute to decision making in their home country.

These insights come from the World Economic Forum's (WEF) annual Global Shapers survey, released this week, which surveyed more than 26,000 millennials from 181 countries to gauge the priorities, concerns, and attitudes of millennials around the globe.

In one survey, WEF asked respondents to name the three most serious issues affecting the world today. For the second year in a row, millennials are most concerned by climate change, followed by large-scale wars and religious conflicts. When asked who should be trusted to fix the issues plaguing the world, millennials said the responsibility belongs to international organizations and themselves.

Below are the top-10 most concerning world issues, according to millennials.

10. Lack of economic opportunity and unemployment (14.2%):

Chinese workers wait for job opportunities inside a local employment center on September 18, 2015 in Yiwu, Zhejiang Province, China.
About 22% of millennials in Sub-Saharan Africa are concerned with unemployment and the lack of economic opportunity in the world compared to just 8.3% of Eurasians.

9. Food and water security (15.1%):

A protester in Flint, Michigan, holds up a sign criticizing the city's water contamination crisis that became a federal emergency and required aid from the National Guard
North American millennials (27.3%) are most concerned by the global lack of food and water, followed by 21.5% of millennials in Europe and 11% in both Latin America/the Caribbean and Sub-Saharan Africa.

8. Lack of political freedom and political instability (15.5%):

Opposition supporters shout slogans as they take part in a rally to demand a referendum to remove Venezuela's President Nicolas Maduro in Caracas, Venezuela, August 4, 2016. The banner reads "Venezuela for the recall."
About 19% of millennials in East Asia/the Pacific are bothered by the lack of political freedom and stability in the world, followed by 18.9% of millennials in Eurasia.

7. Lack of education (16.5%):

Students attend school in a temporary classroom in Nepal one year after a 7.8 magnitude earthquake killed more than 9,000 people.
North American millennials (21.8%) are most concerned with lack of education around the world, followed by an equal percentage (19.7%) of millennials in Europe and Eurasia. Meanwhile, just 7% of millennials in Sub-Saharan Africa are concerned with a lack of education.

6. Safety, security, and well being (18.1%):

A man in Helsinki waves the Finnish flag. Finland is rated one of the happiest countries on earth, according to the World Happiness Report.
Millennials in Sub-Saharan Africa (24.6%) and the Middle East/North Africa (23.4%) are most concerned with safety and well being around the world, while millennials in Latin America/the Caribbean are least concerned (12.8%).

5. Government accountability and transparency, and corruption (21.7%):

Demonstrators wear masks depicting Brazil's former president Luiz Inacio Lula da Silva (L) and Brazil's President Dilma Rousseff during a protest calling for the impeachment of Rousseff near the National Congress in Brasilia, Brazil, December 13, 2015
About 32% of millennials in sub-Saharan Africa are concerned with world government issues, the highest of the sub-regions, followed by Latin America/the Caribbean (27%) and the Middle East/North Africa (23.2%).

4. Poverty (31.1%):

Weeks before the 2016 Olympic Games commence, children play in a garbage dump in one Rio de Janeiro's largest favela complexes, which suffers from poverty and violence.
Latin American and Caribbean millennials are most concerned with poverty (40.4%), followed by millennials in North America (33.9%) and Sub-Saharan Africa (33.6%).

3. Religious conflicts (33.8%):

In Germany, Yazidi protesters with friends and family in Iraq and Syria call for action to stop ISIS' violent siege.
Many of the world's millennials are largely concerned with religious conflicts, mostly in the Middle East/North Africa (45.1%), South Asia (44.1%), Eurasia (41.8%), and Europe (38.8%).

2. Large scale conflict and wars (38.5%):

Libyan forces allied with the U.N.-backed government fire a shell at Islamic State fighters' positions in Sirte, Libya August 15, 2016.
According to the WEF survey, millennials in Eurasia (54.3%) and the Middle East/North Africa (50.3%) are most concerned with global conflict.

1. Climate change and destruction of natural resources (45.2%):

Protesters calling for massive economic and political changes to curb the effects of global warming hold a sit in around the Wall Street Bull statue on Broadway on September 22, 2014 in New York City.
Millennials in Latin America/Caribbean (51.8%) and South Asia (49.3%) are most concerned with global warming and climate change.

Reference:

          http://www.businessinsider.com/world-economic-forum-world-biggest-problems-concerning-millennials-2016-8#1-climate-change-and-destruction-of-natural-resources-452-10