Vast areas of the Amazon rainforest have been burned for cattle ranching MICHAEL DANTAS/AFP via Getty Images Deforestation has reduced rainfall over the Amazon, suggesting the rainforest could reach a catastrophic tipping point sooner than expected. Satellite observations and rain gauge measurements show that the amount of rain falling in the southern Amazon basin declined by 8 to 11 per cent between 1980 and 2019. Tree cover in that part of the Amazon shrank by 16 per cent in roughly the same period, mainly because the forest was slashed and burned for beef cattle ranching. The northern Amazon basin has suffered far less deforestation and saw only a slight increase in precipitation, which was not statistically significant. While a recent study linked deforestation to drier weather within 300 kilometres, the new research found this connection across a basin more than 3000 kilometres wide. That shows destroying rainforest can also hurt nearby ranches and soy farms, says Dominick Spracklen at the University of Leeds, UK, who worked on the new study. “Some people in agribusiness might …