In 1881, Port Huron Michigan was hit by its second massive fire in 10 years, which burned more than a million acres, destroyed dozens of cities, and killed hundreds of people. We can’t say for sure that any particular fire was caused by low CO2, but we can say that this is exactly what Dr. Hansiniman predicted.
http://news.google.com/pg=5746,2579179&dq=port+huron+fire&hl=en
September 1881 also produced an incredible heatwave, 108 at the Naval Observatory in Washington, DC. That is still the hottest temperature recorded at a DC area weather station during any month.