As world leaders hold climate talks in Paris, research shows that land surface temperatures may rise by an average of almost 8C by 2100, if significant efforts are not made to counteract climate change.

Such a rise would have a devastating impact on life on Earth. It would place billions of people at risk from extreme temperatures, flooding, regional drought, and food shortages.

The study calculated the likely effect of increasing atmospheric levels of greenhouse gases above pre-industrialisation amounts. It finds that if emissions continue to grow at current rates, with no significant action taken by society, then by 2100 global land temperatures will have increased by 7.9C, compared with 1750.

Can you imagine a future where your car is fueled by iron powder instead of gasoline?

Metal powders, produced using clean primary energy sources, could provide a more viable long-term replacement for fossil fuels than other widely discussed alternatives, such as hydrogen, biofuels or batteries, according to a study in the Dec. 15 issue of the journal Applied Energy.

Stabilized flames of different metal powders burn with air, compared to a methane-air flame. Credit: Alternative Fuels Laboratory/McGill University

A study of a million UK women has shown that happiness has no direct effect on mortality nor does unhappiness and stress directly cause ill health.

Studies that claim it had simply confused cause and effect.  

Life-threatening poor health can cause unhappiness, and so unhappiness is associated with increased mortality but that is more confirmation bias than neutral analysis. Smokers also tend to be unhappier than non-smokers but accounting for previous ill health, smoking, and other lifestyle and socio-economic factors, the investigators found that unhappiness itself was no longer associated with increased mortality.

Climate change can influence everything from pine beetle outbreaks in the Rocky Mountains to rising sea levels in Papua New Guinea. In the face of a rapidly changing earth, plants and animals are forced to quickly deal with new challenges if they hope to survive. According to a recent paper by Jason Fridley, associate professor of biology in Syracuse University's College of Arts and Sciences, recently minted SU Ph.D. Catherine Ravenscroft, and University of Liverpool professor Raj Whitlock some species may be able to handle environmental changes better than others.

To give good directions, it is not enough to say the right things: saying them in the right order is also important, shows a study in Frontiers in Psychology. Sentences that start with a prominent landmark and end with the object of interest work better than sentences where this order is reversed. These results could have direct applications in the fields of artificial intelligence and human-computer interaction.

Philadelphia, PA, December 9, 2015 - A new study published in the latest issue of Biological Psychiatry reports the successful and instant reduction of fear in spider-fearful participants following a 2-minute exposure combined with a single dose of a regular pharmacological treatment.

Typical behavioral therapies for phobia take many sessions to produce the desired effect. If recovery could be accelerated, it would reduce distress and save time and money.