China’s Belt and Road Initiative (BRI) must be green and sustainable, President Xi Jinping said in opening a summit on his grand strategy, adding that the massive infrastructure and trade plan would deliver “high-quality” growth for all

President Xi’s plan to rebuild the old Silk Road to connect China with Asia, Europe and beyond has aroused controversy, as some partner nations have bemoaned the high cost of infrastructure projects.

China has not said how much the ambitious plan will cost, but some independent estimates suggest it will run to several trillion dollars.

Beijing has repeatedly said it is not seeking to trap countries that sign up to BRI with debt. It will use this week’s summit in Beijing to address those concerns and recalibrate the policy.