A potential solution for global energy demands is the use of Poplar, a fast-growing tree with high yields, for biofuels.

COLLEGE PARK, Md., Feb. 25 /PRNewswire-USNewswire/ -- Gas money for your tank doesn't grow on trees, but one day you might be filling up with fuel that does.

Five tall trees in a Seattle park have been deliberately killed with an injection of an herbicide, and two more are turning brown, officials said.

Botanical name Liriodendron tulipifera 'Aureomarginatum' Family Magnolia (Magnoliaceae) Category Shade tree Primary uses Specimen Dimensions 60 or more feet tall by 30 to 50 feet across Culture Full sun; prefers a moist, well-drained, deep soil.

Google tops the first 'thought leadership index' compiled by recently formed consultancy The Ledbury Group and opinion research firm Populus. The index claims to reveal which businesses, individuals and not- for-profit organisations are recognised as 'thought leaders'.