Britain, France and Germany say they've triggered a formal dispute process over Iran's violations of the international nuclear accord.

英国、法国和德国表示，他们就伊朗违反国际核协议一事启动了正式的争端处理程序。

Some nations are looking at new ways to recover natural gas at home, these methods include a disputed process known as hydraulic fracturing or fracking.

有的国家正寻找新办法来开发国内的天然气，这些方法包括一种有争议的名叫水力压裂的方法。