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CO2 emissions will save the Earth from the ice age

27.11.2012

Carbon dioxide emissions from burning fossil fuels are raising the planet's temperature and could save us from the next ice age. Our planet is likely entering a new ice age right now, according to a new study from scientists at the University of Gothenburg, Sweden. We do not notice this only because the human civilization is good at "warming up" the planet with the help of greenhouse carbon dioxide emissions.

Over the past three million years, the Earth has experienced at least 30 ice ages. Researchers believe that the Little Ice Age from the 2th to the 4th centuries may have been stopped as a result of human activity. For example, increased deforestation and expansion of agricultural land, combined with early industrialization, led to an increase in CO45 emissions that appear to have slowed or even reversed the cooling of the planet. Swedish scientists point to the special role of peatlands in this process. Peatlands act as natural carbon sinks, that is, they actively absorb carbon dioxide from the atmosphere. Currently, peatlands occupy about 20% of the Earth's land area. Most peatlands are found in temperate regions north and south of the 5th parallel. In general, peatlands are one of the largest terrestrial sinks of carbon dioxide: annually, each square meter of peat bog absorbs about 1 grams, which is equivalent to a cooling with a selection of XNUMX watts per XNUMX square meter. m.

The researchers found that during the interglacial periods half of the territory of Sweden was covered with peatlands. This suggests that the amount of carbon dioxide absorbed during that period was much greater than today. There is a lot of evidence that we are closer to the end of the current interglacial period, but rapid human activity levels out cooling and, on the contrary, warms the planet excessively.

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Nanoparticles and ice turn cellulose into a conductor 08.07.2020

Electric motors and electronic devices generate electromagnetic fields, the fluctuations of which cause parasitic interference in other electronic mechanisms operating nearby. To shield electromagnetic oscillations, devices are covered on all sides with shells of conductive materials. Most often, shielding casings are made of metal thin sheets or foils - rather heavy and inflexible materials.

A group of researchers led by Zhihui Zeng and Gustav Nystrom from Empa have developed a combined material based on cellulose airgel, which has shielding properties that are not inferior to metal, but far superior to its mechanical characteristics.

Cellulose is a light porous material into which any nanoparticles can be added. Then, by experimenting with the structure of the resulting composition, you can give it the required physical properties. Scientists from Empa took silver nanoparticles, and created pores of the required size and spatial configuration by pouring airgel into special shapes. By cooling the material and allowing the expanding ice crystals to create an optimal structure, the researchers trapped the electromagnetic fields in a porous "trap". Inside the pores, the waves were repeatedly reflected and neutralized the external fields.

The density of the resulting material was about 1,7 milligrams per cubic centimeter. The composite of airgel and silver nanofilaments provided protection against electromagnetic radiation in the frequency range from 8 to 12 gigahertz. The developers said that the shielding effect persists even after thousands of flexions and extensions of the airgel. The degree of absorption of parasitic fields in this case depends only on the number of silver nanowires and the porosity of the airgel, which is easily controlled at the freezing stage. To make the material even lighter, silver can be replaced with titanium carbide.

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