What released an estimated 8.7 million tons of the global warming gas?

California’s wildfires sent millions of tons of carbon dioxide into the atmosphere. University of Colorado researchers report that from October 19th to the 26th, an estimated 8.7 million tons of the global warming gas were released. Armed with that report, a key U.S. House committee on energy and warming sought answers from a panel of scientists.
Question: What released an estimated 8.7 million tons of the global warming gas?

Falling ticket prices and rising incomes are leading to rapid growth in global air travel. According to the British government, the number of British air passengers, for example, will more than double in the next quarter of a century. Increases of such an order would mean much more aviation fuel being burned and aviation fuel may be more harmful to the environment than other fuels because the resulting smoke is emitted at high altitudes.
Question: Why is there rapid growth in global air travel in the UK?