Climate change caused by humans could have caused droughts as far back as 1900, according to a study. Scientists looked at data on the climate, as well as on tree rings dating back up to 900 years, giving an insight into moisture levels in soil over a long period of time. In research published in the journal Nature, the team showed that as the amount of greenhouse gasses pumped into the atmosphere rose following the industrial revolution, droughts spiked between 1900 and 1949. “The human consequences of this, particularly drying over large parts of North America and Eurasia, are likely...