This is the 375th most frequent Portuguese word.
global
Relating to or encompassing the whole world.
Here, 'global' is an adjective describing the noun 'aquecimento' (warming) in the context of its worldwide impact.
O aquecimento global é um problema urgente.
Global warming is an urgent problem.
'Global' functions as an adjective modifying 'solução' (solution), emphasizing the need for a worldwide approach.
Precisamos de uma solução global para a crise.
We need a global solution for the crisis.
This usage of 'global' describes 'estratégia' (strategy), meaning comprehensive or worldwide in scope.