Obama said last week that wildfires are getting worse due to CO2.
The single worst wild fire in U.S. history, in both size and fatalities, is known as the Great Peshtigo Fire which burned 3.8 million acres (5,938 square miles) and killed at least 1,500 in northern Wisconsin and the Upper Peninsula of Michigan during the week of October 8-14, 1871
The worst wild fire in western history and the 2nd largest overall in the United States was the Great Fire of 1910. This massive forest fire burned some 3 million acres (4,700 square miles) in Idaho and Montana beginning on August 20-21, 1910. It killed at least 87 people
The largest (and deadliest) wild fire in Canadian history as well as in the northeast of the U.S. was the Miramichi Fire of October 7, 1825. An estimated 3 million acres (4,685 square miles) of forest burned in the Canadian province of New Brunswick and in the U.S. state of Maine. At least 160 people died but the toll may have been much higher since an unknown number of loggers in the area may have perished.
A wild fire in Acadia National Park, Maine during October 25-27, 1947 destroyed much of Bar Harbor, burned 205,678 acres (321 square miles), and killed 16.
Canada’s largest fire in modern history was the Chapleau-Mississagi fire of May and June, 1948 in northeastern Ontario. It burned 691,880 acres (1,081 square miles) and smoke from the fire was dense enough in Texas to cause streetlights to turn on during the daytime in some cities. A smaller but deadlier wild fire, the so-called Porcupine Fire, burned 494,000 acres (772 square miles) in northern Ontario in July 1911. At least 70 people died in several mining camps and communities in the area.
Perhaps the largest wild fire in modern world history was that known as The Black Friday Bushfire in Australia’s Victoria State on January 13, 1939. Some 5 million acres burned (7,800 square miles) and 71 died. About 75% of the entire state was affected and 1,100 homes and log mills were destroyed. Ash from the fires fell in New Zealand some 2000 miles to the east.