Photosynthetic pigmentA photosynthetic pigment (accessory pigment; chloroplast pigment; antenna pigment) is a pigment that is present in chloroplasts or photosynthetic bacteria and captures the light energy necessary for photosynthesis. List of photosynthetic pigments (in order of increasing polarity): Carotene: an orange pigment Xanthophyll: a yellow pigment Phaeophytin a: a gray-brown pigment Phaeophytin b: a yellow-brown pigment Chlorophyll a: a blue-green pigment Chlorophyll b: a yellow-green pigment Chlorophyll a is the most common of the six, present in every plant that performs photosynthesis.
Hubbert peak theoryThe Hubbert peak theory says that for any given geographical area, from an individual oil-producing region to the planet as a whole, the rate of petroleum production tends to follow a bell-shaped curve. It is one of the primary theories on peak oil. Choosing a particular curve determines a point of maximum production based on discovery rates, production rates and cumulative production. Early in the curve (pre-peak), the production rate increases due to the discovery rate and the addition of infrastructure.
