Have you ever wondered if the cute light rail systems some large cities are installing actually get people out of their cars and have a positive environmental impact?
For the first time, researchers have shown that installing light rail on an existing traffic corridor not only gets people out of their cars, but reduces congestion and air pollution.
In the study, planners at the University of Utah measured impacts of a new light rail line in Salt Lake City (University Line) on an existing major thoroughfare (400/500 South). Their analysis showed that traffic near the University has fallen to levels not seen since the 1980s, even as the number of students, faculty and staff at the U has increased, and the commercial district along the corridor has expanded.
Read more ...
Super Moons are full moons that are extra, well, super! They are super because they appear larger in the evening sky than your run of the mill full moon.
In June of last year, a full Moon made headlines. The news media called it a "supermoon" because it was 14% bigger and 30% brighter than other full Moons of 2013. Around the world, people went outside to marvel at its luminosity.
If you thought one supermoon was bright, how about three? The full Moons of summer 2014—July 12th, August 10th, and Sept. 9th--will all be supermoons.
The scientific term for the phenomenon is "perigee moon." Full Moons vary in size because of the oval shape of the Moon's orbit. The Moon follows an elliptical path around Earth with one side ("perigee") about 50,000 km closer than the other ("apogee"). Full Moons that occur on the perigee side of the Moon's orbit seem extra big and bright.
Read more ...
Un nuevo estudio dirigido por la Universidad de Yale cuantifica por primera vez las principales causas de la "isla de calor urbana " (ICU), un fenómeno común que hace que las áreas urbanas del mundo sean considerablemente más calientes que los alrededores y puede incrementar los riesgos de salud para los residentes de la ciudad.
Read more ...
In a study that may both reflect and foretell a warming planet's impact on human health, a research team found a link between hot days and kidney stones in 60,000 patients in several US cities with varying climates. "We found that as daily temperatures rise, there is a rapid increase in the probability of patients presenting over the next 20 days with kidney stones," said study leader Gregory E. Tasian, MD, MSc, MSCE, a pediatric urologist and epidemiologist at The Children's Hospital of Philadelphia (CHOP), who is on the staff of the Hospital's Kidney Stone Center as well as the Hospital's Center for Pediatric Clinical Effectiveness (CPCE).
Read more ...
Astrobiologists from the United States and Germany recorded the highest known level of solar UV radiation to reach Earth's surface. This was around 10 years ago.
On December 29, 2003, the UV Index (UVI) peaked, reaching the blistering number of 43.3 over the Andes Mountains in Bolivia. To put this in context, a beachgoer in the United States would expect a UVI of 8 or 9 on a summer day. Even with an 8 or a 9, one may not escape the day without sunburn.
Nonetheless, it has taken scientists 10 years to detail a report of this data while taking into account all of the variables and anomalies monitored from an international network of dosimeters – or Eldonets (European Light Dosimeter Network) – that measure UV radiation worldwide. This system is comprised of more than 100 stations across 5 continents to account for variation in the atmosphere above each station.
Read more ...
Log books from British whaling ships more than 200 years ago have given new insights into the history of the Arctic sea ice, reports Tim Radford. A new study reveals that the scale of ice melt in the Arctic over the last few decades is new and unprecedented.
The retreat of the ice in the last 30 years is part of a more recent and new pattern of climate change.
British whaling ships from Tyneside in the north-east of England made 458 trips to the edge of the Arctic ice between 1750 and 1850.
Read more ...
