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There Are 3 Trillion Trees On Earth, But We're Removing 10 Million Of Them A Year

At This Rate, There Might Be No Trees Left In 300 Years...
Lucy Sherriff
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Groundbreaking new research has revealed that there are around three trillion trees on Earth, but if current trends continue there might not be any left in a little over 300 years.

According to the new research, we are removing 15 billion trees a year - but only replanting five billion of them. Under those estimates, if deforestation continues at the same rate, then all trees could have disappeared from Earth in 304 years.

The three trillion estimate is eight times as big as previously thought, although researchers have warned the higher number does not change anything.

The assessment, carried out by a team at Yale University who combined ground survey data with satellite images, revealed an annual net loss of "about a third of a percent of the number of trees globally," according to the report's co-author Dr Henry Glick.

"That doesn't seem to be an insignificant portion and should probably give us cause for considering the role that deforestation is playing in changing ecosystems," he said.

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Amazon rainforest burning; former dense forest becomes a desert.

Dr Crowther, who led the research, said the new total represents at least 420 trees for every person on Earth, but told the BBC's Science In Action programme: "It's not like we've discovered a load of new trees; it's not like we've discovered a load of new carbon.

"So, it's not good news for the world or bad news that we've produced this new number.

"We're simply describing the state of the global forest system in numbers that people can understand and that scientists can use, and that environmental practitioners or policymakers can understand and use."

Crowther pointed out a comparison with ancient forest cover suggests we could have already removed three trillion trees since the last ice age - 11,000 years ago.

"Europe used to be almost covered by one giant forest and now it's almost entirely fields and grasslands. Humans are absolutely controlling tree densities," he told BBC News.

NASA Deforestation Pics
Deforestation In Niger(01 of07)
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Pictured here is the Baban Rafi Forest, which NASA calls the most significant piece of woodland in the Maradi Department of Niger. This area is located on the southern edge of the Sahara Desert in Africa. On the left is Jan. 12, 1976. On the right, Feb. 2, 2007. NASA points out that the darker green areas in the 1976 photo represent the natural landscape of savannah and Sahelian vegetation. In the 2007 photo, these areas are greatly reduced, largely because the population in the area quadrupled. Agricultural demands are a major reason deforestation has increased so dramatically in the past decades. As in the case here, farmers often use these lands at near-continual production, giving the land virtually no time to recover its fertility. (credit:United Nations Environment Programme (UNEP). From Africa Atlas of our Changing Environment (2008); Division of Early Warning and Assessment (DEWA), UNEP, Nairobi, Kenya.)
Deforestation In Bolivia(02 of07)
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On the left is June 17, 1975. The middle photo is July 10, 1992. On the right is Aug. 1, 2000. NASA describes this area as tropical dry forest, located east of Santa Cruz de la Sierra, Bolivia. It has been decimated largely because of population growth and agriculture. What exactly does deforestation mean for our planet? First, Earth's forests provide critical habitats for millions of plants and animals. National Geographic estimates that as much as 70 percent of the world's plant and animal species live in forests and cannot survive without their habitat. Experts believe that tropical forests such as these contain as much as 50 percent of the world's biodiversity. They are declining at a rate of 2 percent of their mass a year, and may be reduced by as much as 25 percent of their original mass by the end of the 21st century. (credit:1986 image taken by Landsat. 2001 image taken by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER). Reproduced from JPL's ASTER website. Courtesy of NASA/GSFC/METI/ERSDAC/JAROS, and the U.S./Japan ASTER Science Team.)
Deforestation In Kenya(03 of07)
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Here we see the effects of deforestation in the Mau Forest Complex, which NASA describes as "Kenya's largest closed-canopy forest ecosystem and the most important water catchment in the Rift Valley and western Kenya." On the left is Jan. 31 through Feb. 1, 1973. On the right is Dec. 21, 2009. Since 2000, as much as a quarter of the forest has been lost, as shown by the yellow arrows in the images. The loss of trees in the planet's water cycle is critical to the advancement of climate change. Trees return water vapor back into the atmosphere, as well as provide ground cover for moist soils. Their removal exposes land to the drying effects of the sun, further aerating dry lands. What's more, trees and vegetation play an important role in absorbing greenhouse gases. (credit:United Nations Environment Programme (UNEP). From Kenya Atlas of our Changing Environment (2009); Division of Early Warning and Assessment (DEWA), UNEP, Nairobi, Kenya.)
Deforestation In Haiti(04 of07)
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Here we see the border of Haiti and the Dominican Republic. On the left is Dec. 28, 1973. On the right is a snapshot taken Jan. 22, 2010. These photos perhaps best exemplify the political and economic strife that can exacerbate deforestation in a region. In the 2010 image, you can see significant deforestation on the Haiti side, with less occurring in the Dominican Republic. Often, the worst examples of deforestation often occur in areas in desperate need of political stability, as rising populations and unstable economies can lead to a greater encroachment on undeveloped lands. NASA calls Haiti embroiled in crisis "without parallel," plagued by both a 2004 political coup against then-President Jean-Bertrand Aristide, and the more recent devastating earthquake of 2010 that killed more than 300,000 people. (credit:United Nations Environment Programme (UNEP). From Latin America and the Caribbean Atlas)
Deforestation In Paraguay(05 of07)
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There are two different kinds of rain forest, temperate and tropical. Both rain forests are notable for having a high accumulation of rainfall when compared to plant growth. Temperate rain forests generally have a lower rate of evaporation and cooler temperatures. They are much rarer and occur in coastal regions at 37-60° latitude. Both kinds of rain forests are found on every continent except Antarctica, and only 50 percent of these forests remain on Earth. Here we see part of the South American Atlantic Forest, which NASA calls one of the most threatened tropical rain forests on Earth. On the left is Feb. 23, 1973. On the right is Jan. 10, 2008. In almost three decades, the forest has been cut down to only 7 percent of its original size. The forest runs along the Atlantic coast through parts of Brazil, Paraguay and Argentina. However, it is the Paraguay part of the forest that has been most decimated. Tropical rain forests of our planet play a key part in cooling the planet. And this is not just South America's problem. "Tropical deforestation will disrupt rainfall pattern far outside the tropics, including China, northern Mexico, and the south-central United States," writes NASA. (credit:United Nations Environment Programme (UNEP). From Latin America and the Caribbean Atlas of our Changing Environment (2010).)
Fires Along Rio Xingu, Brazil(06 of07)
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One of the most utilized methods of deforestation is the "slash-and-burn" technique used to clear farmland. Trees large and small are cut down and burned to make way for agriculture or livestock use. The negative effects of slash-and-burn techniques are compounded by the releases of excessive amounts of carbon dioxide and methane into the atmosphere. Trees are vital to the Earth's water cycle and cooling ability, and their very destruction exacerbates the issue. Slash-and-burn techniques have been used excessively in the Amazon rain forest since the 1960s. Here we see a photo taken from the International Space Station, showing slash-and-burn along the Rio Xingu, or Xingu River, in Matto Grasso, Brazil. "For a sense of scale, the river channel is approximately 63 kilometers (39 miles) long in this view." writes NASA of this photo. One-fifth of the world's fresh water supply is found in the Amazon basin. (credit:Astronaut photograph ISS029-E-8032 was acquired on September 17, 2011, with a Nikon D2Xs digital camera using a 200 mm lens, and is provided by the ISS Crew Earth Observations experiment and Image Science & Analysis Laboratory, Johnson Space Center. The i)
A Perfect Storm(07 of07)
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While many may think of the destruction of the rain forests as a third-world problem, it is an issue of concern for the entire planet. Dust storms have increased in strength and occurrence in the past decades around the world. NASA directly connects the rapid repetition of strong dust storms in China to deforestation. Here we see an immense dust storm traveling across Jilin Province in northeastern China, which eyewitnesses said left "the skies as dark as midnight." In saving the rain forests, we may ultimately save much more than that. Nature.org points out that at least 2,000 tropical forest plants have been identified as having anti-cancer properties. Further, the U.S. National Cancer Institute has identified 70 percent of plants as useful in the treatment of cancer -- plants that are found only in rain forests. While efforts have been made to curb deforestation around the globe, much more needs to be done. You can learn more about the preservation of rainforests here. (credit:NASA)
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