G20 Summit Focuses on Global Warming Leaders from the world’s largest economies gathered in Rio for G20 Summit this week to tackle pressing global issues. Among topics like poverty and hunger, climate change emerged as the main point of contention.

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.

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.