F & # 39; about twelve years, the Earth's climate will resemble that of the middle Pliocene, a period whose beginning can & # 39; trace more than 3 million years, According to a new study by American and British scientists.
B & # 39; in particular, the document warns that if humanity does not reduce emissions & # 39; & # 39 gas emissions; effect & # 39; greenhouse until the year 2150, the Earth's climate can & # 39; comparable & # 39; that of the Eocene period, 50 million years ago, when the 13 grade and there was almost no ice.
"We are moving towards a very dramatic changes in & # 39; extremely short, reversing & # 39; pattern planetary cooling in & # 39; material & # 39; centuries ", warns John & # 39; Jack & # 39; Williams, professor of Geography at the University & # 39; Wisconsin-Madison, in the United States." If we think about the future in & # 39; past time, unexamined territory for human society ", he adds.
Adding & # 39; 13 degrees to 2150?
The researcher and his colleagues studied the similarities between projections of future climate set out in the Fifth Report & # 39; Assessment of the Intergovernmental Panel on Climate Change and various periods & # 39; geological history as the Early Eocene, Middle Pliocene, the last interglacial (129000-116000 years ago), the Middle Holocene (6,000 years ago), the pre-industrial era (before 1850 AD) and the beginning of the century 20.
also used the "Route Representative Concentration 8.5" (RCP8.5), representing future climate scenario in which we do not nnaqqsux emissions of greenhouse gases, and also RCP4.5, scenario by reducing humanity & # 39; moderate way greenhouse gas emissions by & # 39; effect & # 39; greenhouse.
In both projections the Earth's climate was similar means more to Pliocene 2030 (Under RCP8.5) or 2040 (RCP4.5 below). However, in & # 39; & # 39 longer period, a time and under the RCP8.5 scenario, the weather continues to warm up starts similar to Eocene in 2100,to get more similarities with & # 39; this period of the year 2150.
In the Pliocene temperatures ranged 1.8 and 3.6 degrees higher than now, while during the Eocene temperatures were average to 13 grade. Also, scientists suggest that all species on Earth had an ancestor who survived the Eocene and Pliocene, though remains to be seen if the man and the flora and fauna they will adapt to these rapid changes.