The highest tree species in the world are threatened

Among the oldest living plants on Earth, giant plants face a range of threats from deforestation, drought and climate change.

Sam (Sequoiadendron giganteum)

According to Discovery News, it grows only in 75 small forests along the mountainside west of the Sierra Nevada range in California, USA.The tallest tree found is 84 m in size.They are being threatened by climate change.Summer is longer and drought makes the snow ice layer not thick enough for young trees to survive.(Photo: Corbis).

Douglas fir (Pseudotsuga menziesii)

Named after the first person to discover it, David Douglas, 18th-century Scottish biologist, this plant can be as high as 91 m.It is found in large areas from British Columbia to Mexico.Forests of vast Douglas fir are being destroyed by woodcutter loggers.(Photo: Corbi).

Oak Pendunculate (Quercus robur)

Although found in many parts of Europe, North Africa and West Asia, this plant is often referred to as British oak.It is also imported into the Northeast and Midwestern United States.A tree in Poland recorded more than 42 m tall.In Europe, oak Pendunculate is threatened by wildfires and high winds, according to a European Union report in 2008. (Photo: Discovery).

Manna Gum (Eucalypyus viminalis)

Manna Gum eucalyptus is found in cold climates of Australia.The leaves of the plant are a source of food for koalas.The highest tree reaches nearly 91 m.(Photo: Ottre).

Redwood (Sequoia sempervirens)

The tree is native to central and northern California, dating from the Jurassic period.Some trees have been recorded for nearly 2,000 years.The tallest tree reaches 111 meters.The cabbage is in danger of losing its habitat and being affected by climate change.(Photo: Ashley Cooper / Corbis).

Frequency (Eucalyptus regnans)

This species is found in areas with heavy rainfall and fertile soil in Victoria and Tasmania, Australia.The tallest tree is up to 91 m in size.Ash tree is being overexploited.(Photo: Corbis) .

Toog Philippines (Petersianthus quadrialatus)

This tropical plant is found in southeastern Philippines.A giant tree in northeastern Mindanao was recorded at 88 m high.This species is threatened by logging and forest destruction for cultivation.(Photo: Dainius Pal).