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The World Economic Forum's (WEF) flagship annual report surveyed 750 experts to identify the most significant global concerns. Here are the top five:

Environmental risks, which have grown in prominence over the 13-year history of the Global Risks Report, are an area of particular concern. The Global Risks Report 2018 looks at five categories of environmental risks: extreme weather events and temperatures; accelerating biodiversity loss; pollution of air, soil and water; failures of climate change mitigation and adaptation; and risks linked to the transition to low carbon. All of these risks ranked highly on both dimensions of likelihood and impact.

Three out of 10 top global risks are also related to water, according to a WEC study.

The global paradox that a third of all food grown and produced never makes it into people's mouths - even as 800 million people suffer from hunger - finally may be getting the attention it deserves. Thirty leaders from business, government and foundations gathered in Davos, Switzerland, for the World Economic Forum vowed Thursday to work to cut food waste in half in the next 15 years.

Fifty of the world's largest businesses, retailers and fishing companies from across the tuna supply chain have banded together to stamp out illegal, unreported and unregulated fishing in their industry, protect the health of oceans and eliminate forced labor from fishing vessels. The agreement was brokered by the World Economic Forum and is supported by policymakers and 18 civil society organizations.

China has sent 60,000 soldiers to plant trees. China plans to grow 6.66 million hectares of new forest this year, having already created 33.8 million hectares (338,000 square kilometres) of forest in the past five years, says Zhang Jianlong, head of the State Forestry Administration, in a report from Reuters. The country wants to increase the area of land covered by woodlands from 21.7% in 2016 to 23% by 2020, according to China Daily.

It is not among the world's biggest producers of oil and gas, nor the biggest consumers, but France is hoping to become an environmental pioneer with its decision not to issue any more oil and gas exploration licences. The government, under newly elected President Emmanuel Macron, has vowed to take the step as part of a transition towards more environment-friendly energy sources.

WEF's annual state-of-play survey asks the views of a range of decision-makers and experts as to what they see as being the biggest risks facing the world today. It appears that while the types of risks have changed little in the last few years, the perceived level of risk and resulting impact has grown. Of the 1,000 respondents, 59 percent pointed to an intensification of risk; just 7 percent suggested a declining of risk.