"By 2050, the world's population will likely increase 35 percent. But is growing more food the only option—or even the best? National Geographic investigates the challenges and solutions to feeding everyone on our planet, based on an eight-month series in National Geographic magazine. Visit http://natgeofood.com for ongoing coverage of food issues as we investigate the Future of Food today on World Food Day."
Tags: sustainability, agriculture, food production, unit 5 agriculture.
TEST A Collection Of The Best Resources For Teaching With The iPad by TeachThought Staff So we thought we’d start an ongoing collection–that is, one that is updated to reflect trends and changes–of the best resources for teaching with the iPad.
Scientists say that climate change is happening right now. We see it in the brutal heat, drought, wildfires, and storms afflicting much of the United States. And carbon pollution is also contributing to unprecedented levels of childhood asthma.
TEST How To Burn Yourself Out As A Teacher by TeachThought Staff We published a post last year titled, “Why Good Teachers Quit.” Nearly 70,000+ social shares–and scores of comments–later, and it’s pretty clear that this idea (captured so well by...
Diane Johnson's insight:
With all the initiatives and changes in standards, this post is very timely.
TEST Teaching Writing With Technology? Blogging Continues To Make Sense by Tracy Collins, Central Michigan University Helping students to cultivate the skills needed for writing is often about cultivating a love of writing.
There are two main forces that can drive sea levels higher. One is something called thermal expansion, which involves the expansion of ocean water as it warms. The other is an influx of additional water, ushered into the sea by melting ice sheets and glaciers. Scientists have long concluded that sea levels are rising. Just look at Miami. Or the Maldives. They’ve also discerned that major ice sheets are melting at a faster clip than previously understood.
What has been less clear, however, is whether the development is recent or not. Over the last several thousands of years, has the ocean risen and fallen and risen again? A new study, just published in PNAS, suggests that the ocean has been surprisingly static since 4,000 B.C..
But that changed 150 years ago. Reconstructing 35,000 years of sea fluctuations, the study, which researchers say is the most comprehensive of its kind, found that the oceans are experiencing greater sea rise than at any time over the last 6,000 years. “What we see in the tide gauges, we don’t see in the past record, so there’s something going on today that’s wasn’t going on before,” lead author Kurt Lambeck, a professor at Australian National University, told the Australia Broadcasting Corporation. “I think that is clearly the impact of rising temperatures.”
How much has the sea risen over the past century and a half? A lot. And it’s surging faster than ever. “There is robust evidence that sea levels have risen as a result of climate change,” Australian government research has found. “Over the last century, global average sea level rose by 1.7 mm [0.067 inches] per year, in recent years (between 1993 and 2010), this rate has increased to 3.2 mm [0.126 inches] per year.” In all, the sea has risen roughly 20 centimeters since the start of the 20th century. “The rate of sea level rise over the last century is unusually high in the context of the last 2,000 years,” the Australian report added.
But it’s not just the last 2,000 years. It’s the last 6,000 years, according to this recent study. And now, the rising sea levels over the last 100 years, is “beyond dispute,” Lambeck explained.
TEST Teachers Shadowing Students: What I Learned By Doing What I Ask Students To Do by Grant Wiggins, Authentic Education The following account comes from a veteran HS teacher who just became a Coach in her building.
Diane Johnson's insight:
I have done this as well, and it's truly a game changing experience!
Ebola virus disease is not an airborne infection. Airborne spread among humans implies inhalation of an infectious dose of virus from a suspended cloud of small dried droplets.
This mode of transmission has not been observed during extensive studies of the Ebola virus over several decades.
Common sense and observation tell us that spread of the virus via coughing or sneezing is rare, if it happens at all. Epidemiological data emerging from the outbreak are not consistent with the pattern of spread seen with airborne viruses, like those that cause measles and chickenpox, or the airborne bacterium that causes tuberculosis.
Theoretically, wet and bigger droplets from a heavily infected individual, who has respiratory symptoms caused by other conditions or who vomits violently, could transmit the virus – over a short distance – to another nearby person.
This could happen when virus-laden heavy droplets are directly propelled, by coughing or sneezing (which does not mean airborne transmission) onto the mucus membranes or skin with cuts or abrasions of another person.
WHO is not aware of any studies that actually document this mode of transmission. On the contrary, good quality studies from previous Ebola outbreaks show that all cases were infected by direct close contact with symptomatic patients.
The Ebola virus is transmitted among humans through close and direct physical contact with infected bodily fluids, the most infectious being blood, feces and vomit.
The Ebola virus has also been detected in breast milk, urine and semen. In a convalescent male, the virus can persist in semen for at least 70 days; one study suggests persistence for more than 90 days.
Saliva and tears may also carry some risk. However, the studies implicating these additional bodily fluids were extremely limited in sample size and the science is inconclusive. In studies of saliva, the virus was found most frequently in patients at a severe stage of illness. The whole live virus has never been isolated from sweat.
The Ebola virus can also be transmitted indirectly, by contact with previously contaminated surfaces and objects. The risk of transmission from these surfaces is low and can be reduced even further by appropriate cleaning and disinfection procedures.
Ebola situation assessmentsFrequently asked questions on Ebola virus diseaseFact sheet on EbolaEbola virus disease - web site
Via Dr. Stefan Gruenwald
The pressure is on teachers this year. Students are preparing to be tested on the new, tougher Common Core State Standards in over 40 states where, in many cases, teachers will be evaluated on the outcome.