This kind of tiny beetle is as big as a grain of cereal, and it is a native species in North America.
According to the report of American Discovery Channel, a research report published this week in the journal Nature shows that Canadian pine beetles emit a large amount of carbon dioxide, destroying large areas of forest. In the recent 21 years, these beetles have released 990 million tons of carbon dioxide, equivalent to the total emissions of Canada's Department of Transportation over five years. Scientists estimate that from now until 2020, pine beetles will release 270 million tons of carbon dioxide. And under the agreement of the Kyoto Protocol, Canada needs to reduce the emission of 270 million tons of greenhouse gases before 2012, which may lead to the failure of Canada's efforts to reduce emissions.