Vienna, city and federal state, the capital of Austria. Of the country’s nine states, Vienna is the smallest in area but the largest in population. From 1558 to 1918 it was an imperial city until 1806 the seat of the Holy Roman Empire and then the capital of the Austro-Hungarian Empire.
Boston is the latest city to announce a city-wide plan that, if passed, would eliminate the use of fossil fuels in new constructions and renovation projects.