There is a localized tendency toward negativity on Earth due to a habitually developed thought pattern that dictates one must be negative. Even so, due to the structure of infinity, half of the points of focus which you may give your attention are always of a positive variety while the other half are negative. Thus, negativity becomes a choice rather than a necessity.
Despite this fact, due to the habitual tendency toward negativity presently prevailing on Earth, aggressive positivity thus becomes necessary to overcome such a tendency. Ergo, one should not just try to be positive, but should try to be as positive as possible through the thinking of the absolutely most positive thoughts available that produce the strongest emotions.