The conference in Poland will be a major test of the world’s collective political will to fight global warming. Following through on promises made in Paris will not be easy.

Brazil’s general election will be one of the biggest tests of its democracy in decades. Here’s a rundown of the candidates and issues to watch.

An outbreak in the DRC has spread to neighboring Uganda, and conflict and mistrust of health workers is impeding international efforts to contain the disease.

The Giant of Africa’s next president will have to contend with daunting security and economic challenges.