منابع مشابه
Will We Ever Stop Using Fossil Fuels?
F ossil fuels provide substantial economic benefits, but in recent decades, a series of concerns have arisen about their environmental costs. In the United States, for example, the Clean Air Act in 1970 and 1977 addressed concerns over the emissions of so-called conventional pollutions, notably airborne particulate matter, by imposing fuel economy standards on vehicles and regulations to reduce...
متن کاملWill We Ever Find the Biggest Pumpkin?
It has been a year since the new millennium began. European jurisprudence in its modern form is one thousand years old. I have been working in the field of law for some 30 years. The biggest change I could like to see in the new millennium is that we might learn to ask questions that are small and clearly defined. There are probably no exact answers to the big questions. I will be true to my co...
متن کاملCesarean sections in Brazil: will they ever stop increasing?
OBJECTIVE To describe trends, geographic distribution, and risk factors for cesarean deliveries in Brazil in 2000-2011, and to determine if efforts to curtail rates have had a measurable impact. METHODS This was an observational study using nationwide information from the Department of Informatics of the Unified Health System (DATASUS). Individual level analyses were based on data regarding m...
متن کاملWhy Aren't We Using 3D User Interfaces, and Will We Ever?
Despite decades of interest and research in 3D user interfaces, most of us continue to communicate with our computing technology via primarily 2D interfaces. Even the most sophisticated software that allow artists to create dazzling 3D special effects in movies, or designers to construct sublimely beautiful 3D physical artifacts, rely on 2D interfaces to generate the 3D output. Why? Is all our ...
متن کاملControversies in the antiphospholipid syndrome: can we ever stop warfarin?
Patients with antiphospholipid syndrome are at increased risk for recurrent arterial and venous thrombosis and therefore benefit from long term warfarin therapy. The optimal duration of warfarin therapy after a first venous thromboembolic event is however a matter of some controversy and many questions remain unanswered. After reviewing and analysing the available evidence, we discuss some comm...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Economic Perspectives
سال: 2016
ISSN: 0895-3309
DOI: 10.1257/jep.30.1.117