In a world where climate change, air and water pollution, biodiversity loss, water scarcity, ozone depletion, and other environmental problems overlap, a fix in one arena can cause trouble in another. Here are a few examples of what might be called Earth's "zero-sum" dilemma in the 21st...

Mexico is just minutes away on foot, the time it takes to walk across one of the bridges that span the Rio Grande, intimately connecting Laredo, Texas to its Mexican sister Nuevo Laredo. The wall Donald Trump promises to build would slice through that, and here as elsewhere in America...

Turkey has no problem with Kurds and aims to fight terror groups Daesh, PKK and its Syrian affiliates PYD/YPG, threatening national security, President Recep Tayyip Erdogan said in a phone call with his U.S. counterpart on Monday.  A statement from the Turkish presidency said Erdogan...

President Donald Trump’s nominee for attorney general will tell senators “it is vitally important” that special counsel Robert Mueller be allowed to complete his Russia investigation, and said he believes Congress and the public should learn the results, according to remarks prepared for...