Brazil pushed for concerted action to alleviate hunger Monday as it hosted a summit of the Group of 20 leading economies amid global uncertainty over two major wars and incoming U.S. President-elect Donald Trump.

Set against a backdrop of political turmoil, it's going to be a big ask for the leading rich and developing nations to sign up to any meaningful declarations.

Leaders from the Group of 20 major economies on Monday discussed proposals to reduce poverty, support developing nations and reform global institutions to give more voice to the "Global South" as they braced for whiplash from U.