Chinese policymakers will use ambitious goals for cutting greenhouse gas emissions to put the world's largest energy consumer on track toward a low-carbon economy, said Xie Zhenhua, China's top climate official.

During a two-day summit in Brisbane, Australia, G20 leaders agreed to set out domestic post-2020 targets as soon as possible, preferably early next year.

They also stressed the importance of how the mitigation of climate change would be financed.