Amazon

The Importance Of The Amazon Rainforest Fires

September 10, 2019 By EarthWise Leave a Comment

The Amazon rainforest covers extensive parts of Brazil, Peru, Colombia, and small parts of six other countries. It is the largest rainforest in the world and is instrumental in driving the weather and climate in South America.

The raging wildfires in the Amazon rainforest are a source of great concern. The Amazon is always prone to wildfires during the dry season in South America, but the extent and number of fires this year cannot be attributed simply to drought. The surge in fires has come from illegal deforestation by loggers and farmers, who are using the cleared-out land for cattle ranching.

Rainforests produce consistently high amounts of rainfall throughout the year by pulling water from the soil and then releasing it into the atmosphere. The Amazon rainforest essentially makes it rain in South America.

Over time, the forest plays a crucial role in cycling carbon out of the atmosphere by turning it into biomass. The Amazon jungle sucks up as much as a quarter of the planet’s atmospheric carbon dioxide.

Pristine rainforest burns less frequently and less intensely than cleared and recovering forest. As more and more of the Amazon rainforest is deforested, it becomes more likely to burn each year.

The major disruption of the water dynamics in South America has the potential to not only drive the weather in South American countries but even potentially influence natural resources like snow packs in the Northern Hemisphere.

The skies of Sāo Paulo, Brazil’s financial hub have been dark at midday because of the Amazon fires. This is like having a fire in California and seeing the smoke in Boston. The Amazon rainforest fires are a big problem for the whole world.

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The Amazon Rainforest has been burning for weeks. Here’s why that matters.

Photo, posted August 21, 2019, courtesy of NASA Goddard Space Flight Center via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Trees And Methane

August 14, 2019 By EarthWise Leave a Comment

The Amazon is a source of many mysteries. One that was as troubling as it was mysterious was the large amounts of methane emissions coming from the rainforest that were observed by satellites but that nobody could find on the ground. In total, there were 20 million tons of methane whose origin was unknown.

An expedition by a British postdoctoral researcher who spent two months strapping gas-measuring equipment to thousands of trees has solved the mystery. It turns out that trees, especially in the extensive flooded forests, were stimulating methane production in the waterlogged soils and pumping it into the atmosphere.

This research has uncovered a previously-ignored major source of the second most important greenhouse gas in the world. Apparently, most of the world’s estimated 3 trillion trees emit methane at least some of the time.

This in no way implies that trees are bad for the climate and therefore should be cut down. The reality is that the carbon storage capability of trees far outweighs their methane emissions. But since corporations these days are planting trees to offset their carbon emissions, it is essential to know if their numbers add up. Carbon accounting has to include the complex chemistry of trees and methane.

Wetland tree trunks can act as passive conduits for methane generated by micro-organisms in waterlogged soils. The solid-looking trunks contain spaces and channels through which gases travel up and down. But in wetland systems, trees also create the conditions, and provide the raw materials, for methane generation by micro-organisms. Trees are essentially bioreactors. Some trees even actively generate methane from photochemical reactions in their foliage.

Understanding the interactions of ecosystems and the atmosphere is a complicated business.

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Scientists Zero in on Trees as a Surprisingly Large Source of Methane

Photo, posted December 13, 2008, courtesy of Ivan Mlinaric via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Deforestation In The Amazon Rainforest

December 19, 2018 By EarthWise Leave a Comment

The Amazon rainforest is the biggest in the world. In fact, it’s larger than the next two rainforests combined. The Amazon rainforest covers more than three million square miles, roughly the size of the lower 48 states. It functions as a critical sink for carbon in the atmosphere, and is home to 10% of all known species in the world. The region’s biodiversity is so rich that scientists are still discovering new plant and animal species today.

Losing Forests Is Felt Far Away

July 6, 2018 By EarthWise 2 Comments

Large areas of forests in our country are vulnerable to drought, fires and disease. When forests are heavily damaged, there are well-known local impacts: drier soils, stronger winds, increased erosion, loss of shade and loss of habitat.

Climate Change And Temperature Variations

June 20, 2018 By EarthWise Leave a Comment

It’s no surprise that not everyone on the planet is equally responsible for the effects of climate change. For instance, the Northern Hemisphere, which is home to 13 of the 15 largest countries by GDP, emits far more greenhouse gases than the Southern Hemisphere does. But the whole planet heats up as a result.

Climate Change And Biodiversity

April 19, 2018 By EarthWise Leave a Comment

According to a new study recently published in the journal Climatic Change, up to half of the plant and animal species in the world’s most naturally-rich areas could face local extinction by the turn of the century due to climate change. This projection, jeopardizing the biodiversity in places like the Amazon and the Galapagos, assumes carbon emissions continue to rise unchecked.

Saving Borneo’s Forest

July 3, 2017 By EarthWise

Borneo is the third-largest island in the world, home to part of Indonesia, part of Malaysia, and the small sultanate of Brunei. It is also home to the oldest forest on earth – 130 million years old – which is more than twice as old as the Amazon rain forest.

Deforestation in the Amazon Rainforest

May 30, 2017 By EarthWise

The Amazon rainforest is the biggest in the world, larger than the next two biggest combined. It covers over 3 million square miles, roughly the size of the lower 48 states. For this reason, it functions as a critical sink for carbon in the atmosphere.

Wind Surpasses Water

March 21, 2017 By EarthWise

For many decades, hydroelectric dams were the top source of renewable energy in the United States. But for the first time ever, by the end of last year, installed wind power capacity in the U.S. outpaced hydroelectric capacity.

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The Zombieless Apocalypse

November 29, 2016 By WAMC WEB

Post-apocalyptic fiction is all the rage these days. There are numerous stories featuring an endless list of civilization-ending disasters: asteroid collisions, cataclysmic earthquakes, nuclear wars, supervolcanoes, pandemics… the list goes on and on. Most of the time, humanity either perishes entirely, is reduced to a handful of heroic and astonishingly resourceful souls, or ends up inexplicably as zombies staggering around the landscape in search of brains.

Amazon In Peril

August 18, 2016 By WAMC WEB

A constitutional amendment being discussed in the Brazilian Senate threatens to set back decades of conservation efforts in the Amazon.

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Size Matters

August 10, 2016 By WAMC WEB

One of the crowning achievements for wildlife protection in the US was the establishment of the National Wildlife Refuge system in the 1930s, when the populations of waterfowl were perilously low. Refuges provided breeding and migratory habitat that has allowed a remarkable recovery of many species of ducks and geese.

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