Rise in global pollution resulting increase in the amount of anthropogenic greenhouse gases in the atmosphere in the last 30 years has made that period that warmest for Earth in over 2000 years of history of the Earth according to a joint study by the a group of Chinese and American scientists.
The research of historic data about the atmospheric temperature on Earth was done by the scientists by reading through the well-dated and quantitative air temperature as derived from closely studying a sediment core that was collected at a small alpine lake in subtropical southwest China’s Yunnan Province.
The report on the research was published on the March issue of the international journal of Earth and Planetary Science Letters. The research was carried out by the State Key Laboratory of Lake Science and Environment under the Chinese Academy of Sciences and Columbia University.
Researchers claimed that there has been a fundamental change in the climate system of the Earth over the last 2,000 years. Scientists claim that while earlier natural factors were the ones that were the sole influencers on the Earth’s climate system, in the last 30 years, it has also additionally been forcefully influenced by anthropogenic greenhouse gases in the environment. However, before this research was conducted, a large number of the existing climate models and records were based on records that only went back to about a thousand tears in the history of the Earth in some continents.
The record for the last 2000 years and more are kept in the sediment samples that were collected from the Tiancai Lake, which is located some 4,000 meters above sea level. No human activity has so far affected the quality of the sediment geld information and therefore the data collected from it is a near accurate reflection of multi-centennial-scale temperature fluctuations.
According to Zhao Cheng, a member of the research team, the high-altitude region is sensitive to climate changes. The most important natural factors that has had a profound impact on the climate of the Earth over the years have been solar radiation and volcanic activities. However, the impact of anthropogenic greenhouse gas has emerged to be amongst the major causes of increase in Earth’s temperature during the latter half of the 20th Century, he added.
(Adapted from XinhuaNet.com)