By Jake Spring and Lisandra Paraguassu RIO DE JANEIRO (Reuters) -Diplomatic tensions over global warming will take center stage at the G20 summit in Brazil this week, as negotiators at U.N. talks in Azerbaijan hit an impasse on climate finance that they hope leaders of the world's 20 major economies can break.

Diplomatic tensions over global warming will take centre stage at the G20 summit in Brazil this week. Heads of state arriving in Rio de Janeiro on

With negotiations on climate finance in Baku at a standstill, leaders are turning to the G20 meeting in Brazil for a breakthrough .

Negotiations were deadlocked Saturday at the midway point of the UN climate summit, with hopes pinned on G20 leaders intervening to strike a critical finance pact at the crunch talks.