Many readers also pointed out that in comparison with other foreign policy issues, climate change’s consequences are the broadest and have the most impact.

The United States last year called Islamic State's atrocities in the region constituted genocide.

Although he named no countries, Vatican observers believe he is referring especially to political leaders in several western and eastern European countries.

James Comey is perhaps a better Niebuhrian than Niebuhr himself.

Pope Francis’ condemnation of deterrence is a strong challenge to nuclear strategies of the superpowers, including the United States.

Mugabe's policies are widely blamed for Zimbabwe's economic decline over the past two decades. Millions of economic refugees have left the country, with most going to South Africa.