The study published in the journal Nature on Wednesday shows that greenhouse gases produced by power plants, agriculture, cars, trains and human activity in general have influenced the risk of drought.
The researchers found that drought increased between 1900 and 1949, decreased between 1950 and 1975, and increased since .
Each of these periods seems to correspond to human activities. The drying trend at the beginning of the 20th century, according to the authors, appears to be related to the increase in greenhouse gas emissions.
The authors of the new study also need more research to directly link the project's increase in drought toward the end of the 20th century with increasing greenhouse gas production. They believe that there is a connection but want more evidence.
Researchers found it difficult to estimate the impact of human activity on drought periods. In a few years, one region will be affected by a drought, but in other years, another region will be affected, making it difficult for records to set. Moreover, these records are nowhere near as detailed as the scientists desire to be able to draw any major conclusions .
The researchers report on the new study Interesting workaround: They used modern models in combination with tree records.
When the line is wider, the year was warm. Trees do not grow that much in cold and dry times, so the annual rings would be thinner. If the tree is stressed by the weather like in a drought, it may not grow much.
With Climate Change and the modern age With a rise in greenhouse gas emissions, the authors do not draw a happy future and instead see one in which many droughts occur more.
"The human consequences, especially drying over much of North America and Eurasia, are likely to be severe," the study concludes.
John Quiggin, an employee of the University of Queensland, who deals with climate science topics, would agree.