New research finds that small pollution particles emitted by coal power plants are far more harmful to human health than previously thought.
NATO extends an invitation to Montenegro to join the 28-nation alliance.
The U.N. calls for a rapid scale-up of HIV investment on World AIDS Day, and Canada and Australia seek to repair their images at Paris climate talks.
President Obama attends pivotal U.N. climate talks in Paris and the E.U. will pay Turkey to tighten its borders in the hope of reducing refugee flows.
The U.N. warns that political crisis in Burundi is dragging the country toward civil war.
Russia threatens to cut off coal and gas shipments to Ukraine, and a bomb blast kills at least 11 members of Tunisia’s presidential guard.
Balkans countries begin turning away asylum seekers not from Afghanistan, Iraq or Syria, and Canada it won’t resettle any unaccompanied men.
The U.N. Security Council encourages all able nations to fight the Islamic state, and E.U. dials back its freedom of movement agreements.
Hillary Clinton details her strategy to defeat the Islamic State, highlighting policy differences with the Obama administration.