Extreme Drought: British Columbia's Vancouver Island Climate Change Record
It is unequivocally true that climate change, both mild and extreme, is always happening - paleoclimatology research evidence establishes that.
There is no debate that climate change existed prior to humans' impact on Earth, and will continue regardless of whether human CO2 emissions persist or cease.
Scientists continue to investigate past climate change events to better understand modern climate change, including extreme drought.
Case in point: scientists recently published peer-reviewed research that identified extreme drought periods on Canada's Vancouver Island, specifically the British Columbia Tsable River region.
Their research confirmed that since 1520AD, and prior to the instrumental record, extreme droughts took place that were of equal severity to those of modern droughts.
"Severe summer streamflow droughts are impacting many watersheds on Vancouver Island, British Columbia. Small coastal basins that are the primary water source for most communities and essential to Pacific salmon populations have been particularly affected...Explaining 63% of the instrumental streamflow variability...Our findings suggest that since 1520, 21 droughts occurred that were more extreme than recent “severe” events like those in 2003 and 2009. Recent droughts are therefore not anomalous relative to the ~400 year pre-instrumental record.....The influence of the Pacific Decadal Oscillation on instrumental and modeled Tsable River summer streamflow is likely linked to the enhanced role of snowmelt in determining summer discharge during cool phases."
Past extreme drought events are clear examples of continuous natural climate change that the modern era cannot escape. Humans do not cause climate change, it just happens.