Monday, 30 November 2015

Megacities face megafloods

Between 2030 and 2060, changes in population in coastal zones will leave urban populations in Africa and Asia exposed to flooding from storm surges associated with sea level rise. In Africa, Egypt will be among the worst hit, according to research from Kiel University.

Read more on the Geographical website >>>

Sunday, 29 November 2015

COP21: Why do two degrees matter?

Climate negotiators agreed in Cancun in 2010 to commit their governments to "hold the increase in global average temperatures below 2C above pre-industrial levels". BBC environment correspondent Matt McGrath assesses the significance of that figure, and why it is seen as the gateway to dangerous warming - all in less than the time it takes to make a coffee.

Wednesday, 25 November 2015

Greenland Is Melting Away

Scientists know that the melting of Greenland is accelerating. As the temperature rises, large lakes form on the surface of the ice, which in turn create a network of rivers.

 Read more Times website >>>

Friday, 20 November 2015

The US Racial Dot Map

This map is an American snapshot; it provides an accessible visualization of geographic distribution, population density, and racial diversity of the American people in every neighborhood in the entire country. The map displays 308,745,538 dots, one for each person residing in the United States at the location they were counted during the 2010 Census. Each dot is color-coded by the individual's race and ethnicity. The map is presented in both black and white and full color versions. In the color version, each dot is color-coded by race.

The full interactive map >>>>

About the Racial Dot map >>>

Monday, 16 November 2015

Charles Lyell glacier

140 years on from Charles Lyell's death, the glacier named for him in Yosemite has almost disappeared


from a tweet send by Jamie Woodward

Saturday, 14 November 2015

Paris 13-11-2015

Theatre Bataclan, Le Comptoir Voltaire, Rue de Charonne, Restaurant Le Petit Cambodge , Pizzeria Casa Nostra, Stade de France.

Monday, 9 November 2015

The eruption of the Nevado del Ruiz in 1985

The Colombian volcano Nevado del Ruiz is an active stratovolcano with a history of generating deadly volcanic mudflows (lahars) from relatively small-volume eruptions.

In 1595, a lahar swept down the valleys of the River Guali and the River Lagunillas, killing 636 people.

In 1845, an immense lahar flooded the upper valley of the River Lagunillas, killing over 1000 people. It continued for 70 kilometers downstream before spreading across a plain in the lower valley floor. The young village of Armero was built directly on top of the 1845 mudflow deposit. Over the ensuing years, Armero grew into a vibrant town with over 27,000 residents.

On November 13, 1985, history repeated itself for the third time in 400 years, with another eruption and another deadly lahar racing down the River Lagunillas.

The eruption was not very alarming, but the lava flow combined with melting snow took everything resulting in a high speed Lahar on his way down.
This time, over 23,000 people were killed, including most of the residents of Armero.

More resources :
an Diego State University about the Nevado el Ruis >>>>
BBC "on this day">>>
A video footage about Armero>>
The volcaono that changed the course of risk management >>>

Tuesday, 3 November 2015

What's Up With the Quakes Before a Volcano Erupts?

EARTHQUAKES AND VOLCANOES are intimately linked. They are both products of the plate tectonic process that is constantly reshaping the surface of the Earth. But even beyond that, earthquakes are some of the best clues we have that a volcano might be heading towards an eruption. So, why are there earthquakes in the days-months-years before a volcano erupts and why do some earthquakes lead to an eruption and some don’t? Well, it is a little more complicated than it seems.
The "Whaleback" at Mount St. Helens seen in February 2005. The movement and eruption of this slug of magma generated earthquakes under St. Helens

Erik Klemetti on this issue on Wired >>

Sunday, 1 November 2015

The Popocat├ępetl

The Popocatepetl in Mexico is a active Volcano.

Also last week Popo erupted on Tuesday, belching ash and smoke across blue skies. This mountain is 80km south-east of the capital, Mexico City. A national civil protection coordinator, Luis Felipe Puente, says the eruption rose 2,500 metres above the crater. The recently more active Colima, or Fire, volcano is roughly 400km west of the capital. [Source The Guardian]

More Resources
The Global Volcanism Program >>>
4 types of volcanoes >>> 
More active volcanoes on the world >>>