EARTH DAY for GLOBALWARMING

Austrian scientists found that 13,000 years ago until 19,000 years there was no summer "real" on Earth.

When it, the average temperature in summer is very low and volatile.

Kerstin Huber, a scientist at the Institute for Limnology, Austrian Academy of Sciences, declared in an academic report at the end that, according to the analysis of the remaining algae and pollen from sediment in Lake Lange, Carinthia, Austria, there was no summer in the area at the time, and series of fluctuations of almost 8 degrees Celsius.

According to the report, after the end of the ice age about 20,000 years ago, temperatures on Earth becomes increasingly warmer. Around 17,000 years ago, Earth experienced a drastic cold wave that lasted for almost 2,500 years. Until 14,500 years ago, temperatures rose again.

At that time, in the Lake Lange, the average temperature of water in summer has a quick change. During warm temperatures, the temperature reached 18 degrees Celsius, while in the cold, the temperature only reached 10 degrees celsius. Atmospheric temperature in the region also showed fluctuations conditions the same.

As climate change, conditions that would directly affect the various types of plants that grow, such as bushes. While grass and algae can survive at low temperatures, while trees and other plants just right for warmer weather.

It's very similar to tree-ring, the sediment is mixed with algae and pollen of terrestrial plants has been accumulated from day to day at the bottom of the lake, which also stores information about the climate.

Therefore, by analyzing sediment algae and pollen from various times in the bottom of the lake, will be understood that current climate conditions by identifying the types of plants there.

Some scientists Austria sediment core collected from depths of 3.4 to 4.4 meters at the bottom of Lake Lange, in line with the age of 19,000 to 13,000 years ago. By analyzing the types of algae and pollen in the sediment core, they concluded that the planet's temperature was low and volatile.

In the report, Hubert first place in the competition "scientists writing press releases 2009", organized by the association "dialogue-genetic engineering" through cooperation with the Austrian Press Agency (APA).