Dating white pine trees

Fifty years ago, red spruce was the equivalent of a canary in the coalmine signaling the effects ...

Scientists expect trees will advance upslope as global temperatures increase, shifting the tree line—the mountain zone where trees become smaller and eventually stop growing—to higher elevations.

The world's oldest recorded tree is a 9,550 year old spruce in the Dalarna province of Sweden.

Cinnamon-scented bark and heights up to 100 feet distinguish the ponderosa pine (Pinus ponderosa), which grows in USDA zones 5 through 9.Therefore, we can now see that these spruces have begun to straighten themselves out.There is also evidence that spruces are the species that can best give us insight about climate change. The shorter Eastern white pine grows in USDA zones 4 though 9 up to 30 feet tall with gray-green needles. The red pine (Pinus resinosa) grows in USDA zones 3 through 7 and reaches up to 75 feet tall.

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