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Deforestation | Cyberchase | PBS LearningMedia

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Trees provide the Earth with many things that help other plants and animals - including humans - survive, like air to breathe, places to live, and food to eat. In this Cyberchase video, the CyberSquad learns about the importance of forests and replants trees to help combat deforestation.

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Cyberchase . Games . Save the Park! | PBS KIDS

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Build parks before Buzz and Delete take over!

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Watch full episodes of Cyberchase free on PBS KIDS in English and en Español!

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Watch full episodes of Cyberchase free on PBS KIDS in English and en Español!

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Amazon | Franck Prévot

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Amazon | Dr. Seuss

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Amazon | Lynne Cherry | 2000

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Barbara Cooney | 1985

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Amazon | Jeannine Atkins | 2013
NOT #OwnVoices

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Maya Christina Gonzalez | 2014
Amazon | #OwnVoices

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Diana Cohn | 2015
Amazon

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Margarita Engle | 2017
Amazon

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Kenny Bruno | 2017
Amazon

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Andy Carter | 2017
Amazon

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What Can Trees Tell Us About Climate Change 

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What Can Trees Tell Us About Climate Change 

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NASA

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Quite a lot, actually!

But to understand what the trees tell us, we first have to understand the difference between weather and climate.

is a specific event-like a rain storm or hot day-that happens over a short period of time. Weather can be tracked within hours or days. is the average weather conditions in a place over a long period of time (30 years or more).

Scientists at the National Weather Service have been keeping track of weather in the United States since 1891. But trees can keep a much longer record of Earth's climate. In fact, trees can live for hundreds-and sometimes even thousands-of years!

One way that scientists use trees to learn about past climate is by studying a tree's rings. If you've ever seen a tree stump, you probably noticed that the top of the stump had a series of rings. It looks a bit like a bullseye.

These rings can tell us how old the tree is, and what the weather was like during each year of the tree's life. The light-colored rings represent wood that grew in the spring and early summer, while the dark rings represent wood that grew in the late summer and fall. One light ring plus one dark ring equals one year of the tree's life.

Because trees are sensitive to local climate conditions, such as rain and temperature, they give scientists some information about that area's local climate in the past. For example, tree rings usually grow wider in warm, wet years and they are thinner in years when it is cold and dry. If the tree has experienced stressful conditions, such as a drought, the tree might hardly grow at all in those years.

Scientists can compare modern trees with local measurements of temperature and precipitation from the nearest weather station. However, very old trees can offer clues about what the climate was like long before measurements were recorded.

In most places, daily weather records have only been kept for the past 100 to 150 years. So, to learn about the climate hundreds to thousands of years ago, scientists need to use other sources, such as trees, corals, and ice cores (layers of ice drilled out of a glacier).

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What Can Trees Tell Us About Climate Change?

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Tree rings can provide information about past climate!

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Everyone Can Plant a Tree & Help Fight Climate Change

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Everyone Can Plant a Tree & Help Fight Climate Change

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Arbor Day

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Planting trees is a simple thing everyone can do to reduce carbon dioxide, a principal greenhouse gas that contributes to climate change. No matter where you live, you can plant trees...and take a proactive, positive step toward keeping our planet healthy.

Plant trees in your yard and around your home. They'll provide shade to cool your home in summer and windbreaks to reduce cold winds in winter - reducing your energy needs.

Plant trees in your community - in parks, around schools, and in urban areas. Trees help shade buildings and pavement, reducing the heat-island effect and conserving energy.

Plant trees on your farm or rural property. Trees and woody agriculture also protect soil, provide wildlife habitat, shade your home, create windbreaks, and keep streams and rivers clean, while helping to fight climate change.

Plant trees in our national forests. You'll also be helping to restore these beautiful national treasures for future generations to enjoy.

More:

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Everyone Can Plant a Tree - Climate Change at arborday.org

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Planting trees is a simple thing everyone can do to reduce carbon dioxide, a principal greenhouse gas that contributes to climate change. No matter where you live, you can plant trees...and take a proactive, positive step toward keeping our planet healthy. Plant trees in your yard and around your home.

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What Is Deforestation For Kids: Information And Facts

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What Is Deforestation For Kids: Information And Facts

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Active Wild | 2015

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What Is Deforestation For Kids: Information And Facts

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What is deforestation? Information & facts about deforestation for kids. Why are areas of rainforest being lost each year & what is being done to stop it?

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Kids Encyclopedia Facts

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Deforestation is when forests are destroyed by cutting trees ( logging) and not replanting them. The most common reason is to clear the land to make farms, ranches, and cities. Trees are also cut for firewood and lumber.

Deforestation destroys the habitat of many animals, leading to their death and possible extinction. The loss is more severe in primary forests, which are forests that have yet been untouched by humans. Deforestation also releases sequestered carbon.

Restoring trees in deforested places is called reforesting.

Benefit of forests

Forests are often planted to protect against natural disasters. They also help the water cycle function properly. When forests are lost, very often the soil they protected is also lost. This loss of soil is called erosion.

Trees are also important for carbon sequestration. They are important in keeping the proper balance of oxygen (O ₂) and carbon dioxide (CO ₂) on earth. They take in carbon dioxide that humans exhale (breathe out) and release oxygen that humans inhale (breathe in).

Forests have the following functions:

regulating the water cycle

producing soil

preventing soil erosion

providing habitat for animals

providing most of our oxygen

maintaining the proper oxygen (O₂) and carbon dioxide (CO₂) levels

balancing the atmosphere

regulating the temperature

Global deforestation suddenly increased around 1852. As of 1947, the planet had 5.8 million to 6.2 million sq. mi. (15 million to 16 million km ²) of mature tropical forests (forested landscapes in tropical regions), but by 2015, it was estimated that about half of these had been destroyed. Total land coverage by tropical rainforests decreased from 14% to 6%. Much of this loss happened between 1960 and 1990. Scientists have calculated that at this rate, the extinction of such forests could happen by the mid-21st century.

Causes of deforestation

Land has other uses besides growing trees. The biggest uses of land that was once forested are for farming and ranching. Some land is also used for roads and buildings, especially in urban areas. As the population grows, people need to remove more trees. They also use the wood from the trees as lumber to make buildings and other things, or they burn the trees as firewood.

Environmental effects

Atmospheric

Further information: Deforestation and climate change

Deforestation is ongoing and is shaping climate and geography.

When the trees burn or rot, the small amount of carbon that is not absorbed by the soil can return to the atmosphere in the form of carbon dioxide. Scientists believe that since carbon dioxide is a greenhouse gas, deforestation can cause global warming. They have estimated that tropical deforestation is responsible for about 20% of world greenhouse gas emissions.

Hydrological

The water cycle is also affected by deforestation. Trees play an important part in the proper working of the water cycle.

Their canopies catch precipitation, which is then evaporated back to the atmosphere (canopy interception). Without canopy interception, the air would be drier and less precipitation would fall.

Their litter (plant material on the ground around the tree), stems, and trunks slow down surface runoff. Without these, flash flooding would be more likely.

Their roots create macropores - large pipe-like trails - in the soil that increase infiltration of water. Without these trails, water would not flow through the soil as easily.

They absorb groundwater from the soil and transpire moisture into the atmosphere. Without transpiration, the air would be drier and trees would not get the moisture they need because of the lack of precipitation.

Tropical rainforests produce about 30% of our planet's fresh water.

Deforestation changes normal weather patterns, creating hotter and drier weather. This results in more drought, crop failures, melting of polar ice caps, and coastal flooding.

Undisturbed forests do not have much erosion because of plant litter on the ground. Plant litter protects from surface runoff. Forestry operations also increase erosion because of the roads and mechanical equipment they use.

Deforestation in China's Loess Plateau many years ago led to soil erosion. This erosion caused valleys to open. The increase of soil in the runoff causes the Yellow River to flood and makes it yellow-colored.

Erosion is not always a consequence of deforestation. An example would be the southwestern regions of the United States. The loss of grass due to the presence of trees and other shrubbery leads to more erosion than when trees are removed.

Soils are reinforced by the presence of trees, which secure the soil by binding their roots to soil bedrock. When trees are removed on sloped lands, those lands are more likely to have a landslide.

Biodiversity

Forests support biodiversity, providing a habitat for wildlife. Forests also produce medicinal plants. Tropical rainforests are the most diverse ecosystems on Earth and about 80% of the world's known biodiversity could be found in tropical rainforests. When humans remove or destroy large areas of forest cover, the soil degrades and biodiversity is lessened. Some species of plants and animals can become extinct. Some scientists predict that more than 40% of the animal and plant species in Southeast Asia could be wiped out in the 21st century. Other scientists show data that disagree with this prediction.

Health effects

Public health context

Some scientists believe that deforestation exposes people to zoonotic diseases (diseases that can be passed from an animal to a human). Dieseases that are associated with the forest include malaria, Chagas disease (also known as American trypanosomiasis), African trypanosomiasis ( sleeping sickness), leishmaniasis, the Nipah virus, Avian flu, Swine Flu, Lyme disease, HIV, and Ebola.

General overview

According to the World Economic Forum, 31% of emerging diseases are linked to deforestation. According to the US Centers for Disease Control and Prevention (CDC), 75% of emerging diseases in humans came from animals.

In 2016, the United Nations Environment Programme published the UNEP Frontiers 2016 Report. The report shows the causes of emerging diseases:

The latest appearing diseases and their causes are listed on page 23 of the report:

Economic impact

According to the World Economic Forum, half of the global GDP depends on nature. For every dollar spent on nature restoration, there is a profit of at least 9 dollars.

People in both developed and developing countries use wood for building, wood for fuel, and wood pulp for paper. In developing countries, almost three billion people rely on wood for heating and cooking. The economy does well in the short term when trees are cut to make products, but usually, not enough trees can be planted in their place in time for more to be cut down again when they are needed. This causes the economy in the long term to suffer.

Illegal logging causes billions of dollars of losses to national economies each year. The European Union is one of the largest importers of products made from illegal deforestation.

Many countries have taken steps to control deforestation. They have begun programs that they hope will help with the problem.

Reducing emissions: The United Nations and the World Bank have begun to develop programs to reduce deforestation. Because trees take in carbon dioxide, the more trees we have, the less CO₂ will be emitted into the air. Reducing Emissions from Deforestation and Forest Degradation (REDD) is a program that offers money or other incentives (good consequences as a result of an action) to developing countries if they use different ways to build than using the forest's trees.

Government and private policies: In the government area, laws could be made to protect forests, making it illegal to cut trees down without special permission. Private companies could promise to use the land they own the best way they can and to buy products only from companies that do not use deforestation. The Paris Agreement is an example of this.

Land rights: Another way to conserve forests is to change the right to use the land from the public domain to the indigenous inhabitants.

Farming practices: New ways to farm are being developed to get more use out of a single piece of land rather than having to use many pieces of land for different purposes. For instance, in cyclic agriculture, cattle are grazed on farmland that is resting and rejuvenating. The cattle help the land prepare for future plantings by dropping nutrients (from their feces) into the soil.

Monitoring deforestation: Satellite images can help scientists know where on the earth they need to concentrate their efforts in fighting deforestation.

Forest management: Planning ahead by planting more trees than we think will be necessary for future generations is one way to manage our forests well. Reforestation in areas where trees have been cut is another way to manage our forests well. In the areas where "slash-and-burn" is practiced, switching to "slash-and-char" would make the soil rich and healthy for future trees.

Sustainable practices: Bamboo grows and is ready for use faster than trees. Using bamboo rather than wood for building and making products would reduce the need to cut down trees.

Forest plantations: Some places have forest plantations, which are large plots of land that have trees planted on them in an orderly way. They produce more healthy trees per acre than a natural forest.

Interesting facts about deforestation

More than half the world's tropical forests have been destroyed since the 1960s.

In 2019, the world lost an entire soccer field worth of primary rainforest every six seconds.

Forests release carbon dioxide when they are cleared or burned. About 12 percent of global greenhouse gas emissions come from deforestation.

It is estimated that within 100 years, there will be no rainforests.

20% of the world's oxygen is produced in the Amazon forest.

Almost half of the world's timber and up to 70% of paper is consumed by Europe, the United States, and Japan alone.

Worldwide, more than 1.6 billion people rely on forest products for all or part of their livelihoods.

Related pages

Images for kids

In Spanish: Deforestación para niños

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National Geographic

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Explore National Geographic. A world leader in geography, cartography and exploration.

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See the Forests challenge in the Earth Day Ecochallenge Event

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Forests are treasure troves of biodiversity: eight out of ten land-based species live in forests, as well as almost 300 million people. Forests offer food, shelter, medicine, ecosystem services, and many of the raw materials that create the products people rely upon in our daily lives.

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What if there were 1 trillion more trees? - Jean-François Bastin

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What if there were 1 trillion more trees? - Jean-François Bastin

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TED-Ed | 2020

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What if there were 1 trillion more trees? - Jean-François Bastin

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Arbor Day Foundation

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Plant trees to reduce your global footprint, and for all the benefits they provide.