Global ice ages in Earth's history occurred when the level of solar radiation is sharply changed in a short period by geological standards the period of time, American scientists have found. Their work was published in the journal Proceedings of the Royal Society A.
In Earth's history was at least two periods of the Paleoproterozoic 2.4 to 2.1 billion years ago during the Neoproterozoic 850-630 million years ago, when the whole surface of the planet was covered with ice. With the end of the second period of time is associated sudden flowering of complex multicellular life on Earth. Therefore, not only geologists and planetary scientists studying exoplanets lying within the habitable zones, looking for the causes that can trigger a global glaciation.
Scientists have identified nine periods of the greatest intensity of river floods in Europe over the past 500 years. One of them includes the last three decades, which is different from all previous periods of flooding. The study is published in the journal Nature.
Over the past decade, floods in Europe brought large economic losses. They are becoming more frequent and widespread. Scientists geographers from different countries joined forces to find out what distinguishes the current situation from other periods, rich in floods in the past.
Scientists found out that by 2100 most subpopulations of polar bears in the Arctic are under threat of extinction due to reduction of sea ice caused by global warming. The study is published in the journal Nature Climate Change.
Polar bears Ursus maritimus species use sea ice to hunt with him on seals. In the summer, during the melting of coastal ice animals move on land where they have virtually no food and are funded by accumulated fat. Since the warm season in the Arctic lengthened, and the area of sea ice decreases in response to warming, polar bears each year have to be on the mainland more and more time
South African scientists have discovered that aardvarks are usually active only at night, began to leave in search of food during the day. The researchers suggest that this is due to climate change and lack of food. Violation of circadian rhythm, according to biologists, may have a negative impact on the survival of these rare mammals and lead to the disruption of the ecosystem as a whole. The study is published in the journal Frontiers in Physiology.
The African aardvark is the only modern representative of the relic squad trubkozuby. Animals remained only in Africa South of the Sahara. They lead a solitary lifestyle, living in burrows, feed on ants and termites.
The study of annual rings in tree cross-section for the last 600 years showed that extreme climate change began in the middle of the last century. The results were published in the journal Proceedings of the National Academy of Sciences.
Annual rings of trees is a natural document that tells about the climate in a particular period. Working on the creation of the South American drought Atlas (SADA), the scientists analyzed how over the past six centuries, changed the moisture content of the soil in which the trees grow.
In the next few years forty degrees of heat will cease to be anomalous for the Russian regions. About this portal "Ura.ru" said the head of the laboratory of climatology Institute of geography RAS Vladimir Semenov.
As the scientist explained, this is due to climate change. Over the last forty years, Russia has on average warmed by 2-2.5 degrees.
Using climate models, scientists have figured out why after a moderate wet winter and warm spring, there is usually a dry summer. The study is published in the journal Science Advances.
In the summer of 2018, the countries of Central and Northern Europe was struck by a drought caused by an extremely hot summer, which was preceded by an early spring with lots of warm and Sunny days. Before that, a similar pattern was observed in 2003 and 2010. In the latter case, the drought has affected not only Europe, but also Western areas of Russia, and the average summer temperature broke the 500-year record of observations.