*Wildfires turn Canada’s vast forests from carbon sink into super-emitter.* This years emissions amount to three times Canada's usual annual emissions, and the fires are not finished yet.

Further global heating is sure to increase the emissions from burning forest in further years — until it is all burned up. This is the sort of tipping point that can cause unstoppable disaster.

The article describes precautions that might be able to reduce the fires in future years.