The final rule sets a variety of targets depending on the type of plant and the type of coal it burns.

NPR: E.P.A Proposes New Rules on Haze

It can be made from nearly any type of plant, with varying degrees of difficulty.

FORBES: Field of Dreamers

The group studied so-called "C3" plants, the most prevalent type of plant life on Earth for the past 400 million years.

CNN: Plants spread secrets about climate change

To meet these standards, new facilities will not be allowed to exceed emissions of the least polluting power plant currently using the same type of fuel.

FORBES: Paul Krugman's Toxic Shock Syndrome: Mercury Madness

It is a type of power plant.

FORBES: Why You Should Care That Courts Overturn EPA's Carbon Pollution Standard

This month, in the Mojave Desert, a company called BrightSource plans to break ground on a revolutionary new type of solar power plant.

WHITEHOUSE: Weekly Address: Solar Power & a Clean Energy Economy

Scientists have known for a long time that aerosols cool climate by reflecting sunlight and making clouds brighter, but the new study is the first to use a global model to estimate the net effects on plant carbon intake resulting from this type of atmospheric pollution.

CNN: Study: Pollution helps plants absorb C02

Beta carotene is a type of carotenoid, a plant pigment that is a provitamin for vitamin A. During its digestion and metabolism, a percentage is converted to vitamin A, a fat-soluble vitamin that is important for vision, growth and development, and healthy immune and reproductive function.

CNN: Should I take beta carotene as a supplement?

These patterns of action, either the well constructed image plant or the viral propagation of a fetishistic content type, are both highly effective at generating disproportionate reactions.

FORBES: The Hoaxer, The Troll And The Running Of The Digital Herd

Prestwich says French tarragon, which is the type largely imported to and grown in the UK, is a slow-growing plant, which can only be grown from cuttings, not seeds.

BBC: Who, What, Why: Where has all the tarragon gone?