Global+Warming+Notes+3

National Geographic Causes:
 * Greenhouse gases
 * Fossil fuels (cars, factories, and electricity production)
 * Carbon Dioxide
 * Methane released from landfills and agriculture especially from animal digestive systems
 * 1 molecule of methane= 20 times the amount of greenhouse gases in 1 molecule of Carbon Dioxide

National Geographic Effects:
 * melting glaciers and ice
 * animals are on the move because of change in temperature

Best CO2 eliminating trees native to this area Black Walnut Eastern White Pine Northern Red Oak
 * Black Walnut
 * White Pine
 * Red Oak
 * Douglass Fir
 * Can grow to be 70 feet tall and just as wide at the top.
 * Dark brown, nearly black bark
 * ridges in more mature trees
 * wood used as gunstocks, cabinets, and veneer
 * ligth green before ripe, at this time emits brown die which is difficult to remove from hands.
 * husk is hard two halved shell
 * inside husk is walnut
 * Leaves: Clusters of 5 in leaves. Spell w-h-i-t-e
 * Fruit: Cones 5"-8" long, slightly curved, no prickles, each scale usually bears 2 winged seeds.
 * Bark: at young age greenish-brown. Later becomes grooved, scaly, dark brown.
 * Height: ranging from 50'-90'. Original Pennsylvania Pines were 150' and more.
 * one of most valuable timber trees
 * Leaves: Alternate, 4"-9" long 6" wide 5 points
 * Fruit: acorns, kernal is bitter. Need two seasons to ripen.
 * Bark: Smooth Grey or Greenish brown later matures to dark brown or nearly black
 * Other facts: Dominant forest tree through the state that grows to about 90' tall.
 * Many birds and mammals like dear, and bear eat its acorns.
 * Hard, strong wood used for furniture, veneer, and flooring.

Douglass Fir:
 * Leaves: Evergreen needles, grow in clusters of 2, slender. Snap easily when bent double.
 * Fruit: A cone, about 2" long, no prickles, remains attached until the following year
 * Smooth and reddish brown
 * Medium sized tree. Valuable timber tree in northern part of state, the wood is used for construction lumber.
 * Chipmunks, Songbirds, and mice feed on the seeds.