Television CAN be beneficial, depending on content. Conversely, studies have proven that brain cells die off more rapidly when dull programming is observed.
Methane can be used as a fuel for electric generation, heating or transportation. It emits 50% less carbon than coal and 30% less than gasoline, for the same energy.
This is the same as asking it Television is a good thing. It really depends on who you are and what you are expecting to get from it. TV can be seen as a bod thing if you become too dependant on it...