"The global recovery continues, but it remains uneven and falls short of our ambition for strong, sustainable and balanced growth. Downside risks and vulnerabilities persist," the trade ministers said in a joint statement, adding that trade should remain "an important engine" to spur global growth.
The G20 nations, which account for 85 percent of global trade, admitted that protectionism has been rising since the financial crisis, and said that new trade restrictions in the group had reached the highest monthly average registered since the WTO began monitoring in 2009.
Ahead of the meeting, WTO chief economist Robert Koopman warned that restrictive measures could affect industries including air freight cargo, sea based cargo, automobile sales and production, electronics trade, and agricultural raw materials.
The world's leading economies at the weekend pledged to oppose trade protectionism and reiterated a promise not to add new protective measures until 2018.
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Global trade is expected to grow at a tepid 2.8 percent in 2016, the World Trade Organisation (WTO) said in April.
To combat the global slowdown, the ministers said they agreed to improve global trade governance and to work towards easing and liberalising trade.
Concerns over China's production overcapacity in steel have led to trade disputes with the EU and US, and China's vice commerce minister Wang Shouwen said Sunday that the G20 economies "have realised the necessity to take global cooperation to handle the challenge caused by production overcapacity".