BY CHRISTINA NUNEZ PUBLISHED FEBRUARY 7, 2019
https://www.nationalgeographic.com/environment/global-warming/deforestation/
Human-driven and natural loss of trees—deforestation—affects wildlife, ecosystems, weather patterns, and even the climate.
Forests still cover about 30 percent of the world’s land area, but they are disappearing at an alarming rate. Between 1990 and 2016, the world lost 502,000 square miles (1.3 million square kilometers) of forest, according to the World Bank—an area larger than South Africa. Since humans started cutting down forests, 46 percent of trees have been felled, according to a 2015 study in the journal Nature. About 17 percent of the Amazonian rainforest has been destroyed over the past 50 years, and losses recently have been on the rise.
We need trees for a variety of reasons, not least of which is that they absorb not only the carbon dioxide that we exhale, but also the heat-trapping greenhouse gases that human activities emit. As those gases enter the atmosphere, global warming increases, a trend scientists now prefer to call climate change.
The Amazon is losing the equivalent of nearly one million soccer fields of forest cover each year, much of which is cut down to make way for agriculture. When forest is lost, the carbon it sequestered ends up in the atmosphere, accelerating climate change.
Bunches of oil palm fruit are harvested by hand and then trucked to a mill in mainland Malaysia, where they are processed. Ancient forests around the tropics are being cut down to make space for palm oil plantations. When these forests are lost, the carbon they held locked up in their tissues is released into the atmosphere, contributing to further global warming.
The western U.S. has been locked in a drought for years. The dry, hot weather has increased the intensity and destructiveness of forest fires.
The Scherer power plant in Juliet, Georgia, is the largest coal-fired power plant in the U.S. It burns 34,000 tons of coal daily, pumping over 25 million tons of carbon dioxide into the atmosphere each year.
Causes of deforestation:
Farming, grazing of livestock, mining, and drilling combined account for more than half of all deforestation. Forestry practices, wildfires and, in small part, urbanization account for the rest. In Malaysia and Indonesia, forests are cut down to make way for producing palm oil, which can be found in everything from shampoo to saltines. In the Amazon, cattle ranching and farms—particularly soy plantations—are key culprits.
Logging operations, which provide the world’s wood and paper products, also fell countless trees each year. Loggers, some of them acting illegally, also build roads to access more and more remote forests—which leads to further deforestation. Forests are also cut as a result of growing urban sprawl as land is developed for homes.
Not all deforestation is intentional. Some is caused by a combination of human and natural factors like wildfires and overgrazing, which may prevent the growth of young trees.
Why it matters and what can be done:
Deforestation affects the people and animals where trees are cut, as well as the wider world. Some 250 million people living in forest and savannah areas depend on them for subsistence and income—many of them among the world’s rural poor. Eighty percent of Earth’s land animals and plants live in forests, and deforestation threatens species including the orangutan, Sumatran tiger, and many species of birds. Removing trees deprives the forest of portions of its canopy, which blocks the sun’s rays during the day and retains heat at night. That disruption leads to more extreme temperature swings that can be harmful to plants and animals.
In terms of climate change, cutting trees both adds carbon dioxide to the air and removes the ability to absorb existing carbon dioxide.
The numbers are grim, but many conservationists see reasons for hope. A movement is under way to preserve existing forest ecosystems and restore lost tree cover. Organizations and activists are working to fight illegal mining and logging—National Geographic Explorer Topher White, for example, has come up with a way to use recycled cell phones to monitor for chainsaws. In Tanzania, the residents of Kokota have planted more than 2 million trees on their small island over a decade, aiming to repair previous damage.
For consumers, it makes sense to examine the products and meats you buy, looking for sustainably produced sources when you can. Nonprofit groups such as the Forest Stewardship Council and the Rainforest Alliance certify products they consider sustainable, while the World Wildlife Fund has a palm oil scorecard for consumer brands.



























