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  • (birds chirping)

  • - [Narrator] Shrouded in a blanket of clouds they awaken.

  • Their canopies of green glitter in the sun.

  • Their wildlife start to slither.

  • (snake hissing)

  • - Chirp. (birds chirping)

  • - And growl. (growling)

  • - And one of the planets richest ecosystems

  • comes to life.

  • (crickets chirping)

  • Rainforests are the oldest living ecosystems on the planet.

  • Some can trace their origins to over 70 million years ago.

  • Back to a time when dinosaurs still roamed the Earth.

  • While the giant reptiles have disappeared

  • rainforests continue to thrive

  • growing on every continent except Antarctica.

  • Two types of rainforests are scattered across the globe.

  • Temperate and tropical.

  • Temperate rainforests are mainly found in the mid-latitudes.

  • Often near cooler, coastal, mountainous regions.

  • Tropical rainforests are primarily located

  • in warmer climates between the Tropic of Cancer

  • and the Tropic of Capricorn.

  • (thundering)

  • As their names imply, temperate and tropical rainforests

  • are the wettest forests on earth

  • receiving up to about 33 feet of rain per year.

  • This precipitation plays a critical roll in creating

  • an exceptionally lush and biologically diverse habitat.

  • While rainforests only make up about 6100:01:35,770 --> 00:01:38,300 of the Earth's surface area, they are home

  • to over half of the World's plant and animal species.

  • This biodiversity creates benefits

  • that extend far beyond the rainforest boundaries.

  • Rainforest plants produce an assortment of food items.

  • In addition to ingredients useful

  • in everyday products and medicines.

  • In fact, an estimated 70% of the plants used

  • in cancer treatments are only found in rainforests.

  • On an even larger scale, rainforests help

  • to stabilize the planet's climate.

  • It's lush, green vegetation regulate global temperatures

  • by absorbing massive amounts of radiation from the Sun.

  • They also absorb vast amounts of carbon dioxide

  • and convert them into oxygen,

  • about 40% of the planet's breathable air.

  • Over the past few centuries, rainforests have disappeared

  • at an alarming rate.

  • Factors such as economic inequalities, human development,

  • and demand for natural resources have fueled

  • the deforestation of these rich ecosystems.

  • At the current rate, rainforests, which have survived

  • for over 70 million years

  • may completely disappear within the next century.

  • But through educational campaigns,

  • sustainable logging practices,

  • and cooperation with local communities,

  • deforestation may begin to slow down

  • helping to preserve rainforests

  • for many generations to come.

  • (dramatic music)

(birds chirping)

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熱帯雨林101|ナショナルジオグラフィック (Rainforests 101 | National Geographic)

  • 28 2
    Courtney Shih に公開 2021 年 01 月 14 日
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