Posted on September 30, 2015 by Bob Berwyn
Does climate change have an effect on pregnancy and infant health?
Research in Africa suggests drought and heatwaves results in lower birth weight
A complex statistical analysis of health and climate data suggests there may be a link between climate change and birth weight, at least in parts of the developing world. The findings show that a pregnant woman’s exposure to reduced precipitation and an increased number of very hot days results in lower birth weight.
The two-year research project was led by University of Utah geography professor Kathryn Grace, who said the results are a clear warning that climate change may have a direct affect on public health. Continue reading
Filed under: climate and weather, climate change, Drought, global warming | Tagged: Africa, climate change, drought, public health | Leave a comment »
Posted on September 29, 2015 by Bob Berwyn
Dirty snow and ice at the edge of the Greenland Ice Sheet. @bberwyn photo.
Study takes close look at organic debris in Arctic ice cores
Organic biomarkers, in the form of tiny soil and plant particles, have helped ice core scientists track climate shifts linked to changes in the Arctic Oscillation. The research suggests that global warming will lead to more dust in the Arctic, which could speed up the meltdown of sea ice and Greenland glaciers.
The study by scientists with the University of Birmingham examined organic dust transported from Asia and deposited in the Arctic over the last 450 years. During warmer phases of the Arctic Oscillation, more dust was being deposited in the Arctic, according to the findings published in the journal Nature Scientific Reports.
The scientists studyied two ice-cores collected from ice-caps more than 6000 kilometers apart, one from Greenland, the other from Kamchatka, in eastern Russia.Deposits can be dated very accurately by studying the annual layers within the cores — similar to tree rings — which allow scientists to examine deposits going back many years. Continue reading
Filed under: Arctic, climate and weather, climate change, global warming, Greenland | Tagged: Arctic ice sheets, climate change, Environment, global warming | Leave a comment »
Posted on September 28, 2015 by Bob Berwyn
Increasing U.S. oil exports seen as environmental threat by conservation groups.
Conservation groups say recent increases may be illegal
Conservation activists want to know why U.S. oil exports have been increasing despite a Congressional ban. According to a lawsuit filed by the Center for Biological Diversity and ForestEthics, exports increased from 44,000 barrels per day in 2009 to 351,000 barrels per day in 2014.
The lawsuit challenges the Bureau of Industry and Security, an agency within the Department of Commerce, for withholding documents related to its oil-export approval process. The suit was filed in U.S. District Court in San Francisco. Continue reading
Filed under: energy, Environment, global warming, oil drilling | Tagged: climate change, Environment, oil drilling, oil exports | Leave a comment »
Posted on September 27, 2015 by Bob Berwyn
Climate models may be overestimating the carbon-capturing capacity of forests. @bberwyn photo.
Loss of nitrogen a key factor in forest equation
Forests may grow faster as atmospheric CO2 increases, but that doesn’t mean they’ll absorb more of the heat-trapping gas. Instead, a shortage of nitrogen means plants won’t be able to fix as much carbon as projected by some climate models.
“Forests take up carbon from the atmosphere, but in order for the plants to fix the carbon, it requires a certain amount of nitrogen,” said researchers Prasanth who took a close look at the chemistry of secondary forests that are regrowing after deforestation, wood harvest and fires.
“If that ratio of carbon to nitrogen isn’t right, even if you add many times more carbon than it gets currently, the forests cannot absorb the extra carbon,” Meiyappan said. Continue reading
Filed under: Environment, Forest health, forests, global warming | Tagged: climate change, forests, greenhouse gases | Leave a comment »
Posted on September 26, 2015 by Bob Berwyn
Airlines could save money and cut emissions by adjusting the rhythm of transatlantic flights. @bberwyn photo.
Changing flight intervals could save $10 million per year
By Bob Berwyn
Tweaking flight paths across the Atlantic could yield huge savings in fuel costs and help cut airline greenhouse gas emissions.
“If the lateral separation between the aircraft can be reduced, they can be spaced closer and remain more in line with their optimum flight paths. Overall, this would produce fuel economy as most aircraft save fuel at higher cruise altitudes,” said Antonio Trani, director of Virginia Tech’s Air Transportation Systems Laboratory and a professor of civil and environmental engineering.
Trani and fellow researchers reached their conclusions after studying flight information and fuel consumption for air traffic in the North Atlantic oceanic airspace. The research is part of the Future Air Navigation System started in the 1990s that focused on communication between aircraft and air traffic control services, conducted for the Federal Aviation Agency. Continue reading
Filed under: Environment, global warming, Travel | Tagged: airlines, climate change, Environment, greenhouse gases, pollution, transportation, Travel | Leave a comment »
Posted on September 26, 2015 by Bob Berwyn
Study tracks El Niño shifts
Climate change will likely subject many low-lying Pacific island nations to more extreme fluctuations in sea level from year to year, in synch with more intense El Niño cycles. Some years, high sea level will lead to bigger floods, while in other years, big drops in sea level will leave coral reefs exposed, according to researchers based in Hawaii and Australia. Continue reading
Filed under: climate and weather, El Niño, global warming | Tagged: climate change, El Nino, Pacific Ocean, sea level | Leave a comment »
Posted on September 25, 2015 by Bob Berwyn
A new survey shows most scientists in all fields are convinced that human-caused climate change is real.
‘When it comes to climate change, scientists are people, too …’
The consensus on the reality of climate change extends beyond the field of climate science to other disciplines, according to a new study out of Purdue University, where researchers surveyed 700 scientists.
The results show that more than 90 percent believe that average global temperatures are higher than pre-1800s levels and that human activity has significantly contributed to the rise. Continue reading
Filed under: climate and weather, Environment, global warming | Tagged: climate change, climate science, Environment, global warming, global warming consensus | 3 Comments »