What is the most important factor in the yearly increase of CO2 concentration between October and May in Mauna Loa, Hawail? More use of heating during that time in North America There is more tourism in Hawaii during that time (and more tourists) In the Northern Hemisphere, leaves start falling in October and there is much less photosynthesis on Earth as a result More flights taking place around the world during that time 1 point How would you classify the GHG emissions from Tennessee Valley Authority's (TVA) natural gas power plant for TVA? Scope 1 (direct) Scope 2 (indirect, from electricity purchase) Scope 3 (indirect, all other) All of the above