Heads of state arriving in Rio de Janeiro on Sunday for the G20 summit will spend Monday and Tuesday addressing issues from poverty and hunger to the reform of global institutions. Still, the ongoing U.N. climate talks have thrown a spotlight on their efforts to tackle global warming.

Nations returned Monday to the negotiating table at deadlocked UN climate talks in Azerbaijan, but with time running out hopes of a breakthrough are pinned on G20 leaders meeting in Brazil.With the clock ticking,

United Nations talks on getting money to curb and adapt to climate change resume Monday with fresh hope that negotiators and ministers can work through disagreements and hammer out a deal after slow progress last week.