Sunday 30 October 2016

Texaco’s impact on the el Oriente region of the Amazon rainforest

Our world’s never ending thirst for oil and gas has motivated many companies to explore increasingly remote places to find these lucrative resources. This profit driven and unsustainable part of our economy has caused catastrophic results for both environments and communities. Sadly, the Amazon rainforest has become a victim of human greed as the oil and gas industry has caused extensive damages such as deforestation, indigenous conflict, biodiversity loss and, soil, aquatic and air pollution. Most of the Amazon’s oil industry is concentrated in the rainforest’s western part (figure 1) where there is now more than 180 oil and gas blocks covering 688’000km2 of forest controlled by around 35 oil multinationals. This poses a huge threat as the western Amazon is the most biologically rich part of the Amazon rainforest.

Many Amazonian regions have already been deeply impacted by the oil industry. Perhaps one of the most dramatic example of this is seen in Ecuador’s El Oriente region which has been significantly destroyed by oil extraction.

 Figure 1: western part of the Amazon rainforest
 map of the western Amazon




        Ecuador’s economy is heavily reliant on the exportation of crude oil which accounts for 49.6 percent of the country’s total exports. This poses a serious environmental concern as 99 percent of the country’s oil is found in the Ecuadorian Amazon.  A large part of that oil is present in a 130’000 square kilometres area called el Oriente. This area is known for its diverse rainforest and plays a vital part in the catchment basin that feeds the Amazon river network. 

Unfortunately, the area has been under a tremendous amount of environmental and social stress ever since 1967, when Texaco discovered large oil reserves and starting extracting it.

Each stage of the industrial production of oil in el Oriente dramatically damages the environment. The exploration stage which involves the detonation of tons of dynamite to map out the natural petroleum reservoirs leads to substantial deforestation. The drilling stage is responsible for 4’000 cubic meters of toxic waste per well which includes: excess oil, heavy metals, salts and more.  This waste is then deposited into poorly constructed open waste pits (up to 80% of all pits) which renders the waste vulnerable to leaching out and overflowing.  This leads to considerable contamination of the soil, surface and sub surface water systems. The oil processing itself is responsible for an additional 4.3 million gallons of untreated toxic waste a day in 1994 (through the separation of viable oil from waste) which is also poured into the open waste pits. The thick crude oil residue which forms at the surface of these wells is then burned causing acid rain throughout the region.
Even the transportation of petroleum is unsustainable. Indeed, the trans-Andean pipeline which connects the Pacific ports to the el Oriente region has been responsible for the leakage of 16.8 million gallons of petroleum between 1972 and 1990. Most of this has contaminated the headwaters of the Amazonian river systems.

These combined effects caused major biodiversity and habitat loss. Indeed, 159 of Ecuador’s endemic species are now threatened. The soil next to the extraction points have become so toxic that nothing can grow on it anymore and many sources of natural drinking water have been poisoned.


El Oriente’s oil business has also affected indigenous tribes such as the Huaorani tribe who call this part of the forest their homeland. Through the expansion of the oil industry these people have been forced into smaller and smaller areas. Indeed, in 2012 the Huaorani have about 6’800 square kilometres of land which is only a third of their original territory. Not only has their territory been massively reduced, 100s of them were also dislocated in the 1960s when Texaco asked the Ecuadorian government for permission to drill oil on Huaorani land. For many, their lives and culture has changed for ever as contact from the outside world has changed their food source and has even introduced drugs into their lives! Additionally, their constant exposure to leaked crude oil and its constituents (through contaminated water for instance) has been causing symptoms ranging from a headaches to cancers (Harvard report). In sum, the indigenous people of Ecuador have been victims of clear human rights violations.



In conclusion, the oil industry has directly affected both the environment and local populations in the el Oriente’s region of Ecuador. Many indirect events have also fuelled the problem. For instance, money generated by the oil business has allowed the government to build roads and subsidise cattle ranching and agriculture which caused further environmental degradation. Unfortunately, regulations and judicial remedies and information are still grossly inadequate. Consequently, unless a major reform takes place, Ecuador’s government as well as multinational companies will continue to harm thousands of its citizens and destroy their country’s fragile wilderness.  

Sunday 23 October 2016

The Amazon Rainforest as a vital carbon sink

The Amazon Rainforest as a vital carbon sink


The Global carbon cycle essentially refers to the exchange of carbon between the Earth’s various carbon reservoirs. There are 5 main reservoirs (The Earth’s interior, the atmosphere, the biosphere, the oceans and the sediments) which are all interconnected by pathways of carbon exchange.

Changes in the carbon cycle can be environmentally devastating. Indeed, perhaps one of the greatest threats encountered by humans is the ever increasing amount of carbon released into the atmosphere from the burning of fossil fuels. This additional carbon reacts with oxygen to form carbon dioxide, a greenhouse gas which has been responsible for the recent rise in global average temperatures. As the amount of carbon increases in the atmosphere other carbon sinks become more and more important in buffering and controlling this increase.

Consequently, the Amazon rainforest plays a crucial role in the global carbon cycle as it acts as a carbon sink (which refers to an area’s ability to store and absorb CO2 from the atmosphere). Indeed, as trees grow they absorb much more CO2 (in the order of hundreds of millions of tons) than is released by tree death. Consequently, the Amazon holds 17 percent[1] of all Earth’s terrestrial vegetation carbon stock.

However, human impacts have put the rainforest under an increasing amount of strain both directly through rapid deforestation and indirectly through changes in climate patterns caused by warmer global temperatures.

The Amazon has witnessed an increasing amount of droughts in the past decades which is in part caused by an increase in El Nino events which leads to dry conditions in the northern Amazon[2]. Consequently, average rainfall levels dropped nearly 3.2 percent per year between 1970 and 1998[3] in the Amazonia region. There have also been extensive dry periods such as the ones in 2005 and 2010 which lead to basin wide losses in biomass.

The 2010 drought for instance, lead to a higher biomass mortality rate and a lower biomass productivity rate[4]. There was also an increase in wild fires due to the dry conditions.  As a result, it has massively reduced the Amazon’s ability to act as an efficient carbon sink as the forest essentially became carbon neutral (meaning that it is absorbing as much carbon as it is releasing).

Unfortunately, the effects of a drought are not only catastrophic in the short term but they are also alarming in the long term. Indeed, the effects of a drought such as the one in 2005 has “persisted for years” with the damage in the forest canopy lasting “right up to the subsequent drought in 2010”[5]. Consequently, in the future the Amazon won’t be as efficient in storing carbon than in the past as trees will become increasingly damaged due to the combined effects of persistent droughts and slow recovery times.

Not only has climate variation impacted the Amazon’s ability to act as a carbon sink. Extensive deforestation has also been a major culprit. Indeed, if deforestation continues at this current rate most of the Amazonian tropical forests would disappear in 50 to 100 years[6]. Currently, the Amazon deforestation is causing up to 10 percent of all greenhouse gas emissions due to the removal of forests which would have been able absorbed that CO2 if they were still there. Unfortunately, this is contributing to our Earth’s rising temperatures.

In conclusion, due to human activity, the Amazon trees have removed nearly a third less carbon in the past decade than before[7] and have suffered major changes in biomass (figure 1). Still, the Amazon absorbs more CO2 than it releases making it a vital carbon sink. However, if current rates of deforestation and droughts continue at this speed, the Amazon will become permanently carbon neutral which would disrupt our planet’s entire carbon cycle leading to catastrophic events such as massive loss of biodiversity and even faster increases in global temperatures.

Figure 1 the Amazon rainforest's net biomass change, productivity and, biomass mortality over the past 25 years[8]:

Amazon graphs
Pinterest


 Graph b shows plateauing growth rates during the 2000s, while graph c shows a strong upwards trend in tree death over the last 20 years. The slower growth and increased die-off combine in graph a to produce a drag on the amount of carbon soaked up by a hectare of forest each year. Droughts during 2005 and 2010 are clearly visible as large increases in mortality. Photograph: Nature


Short BBC clip on the Amazon rainforest which is our planet's lungs:





Sources:

Web sources:


Research papers:

Feldpausch, T. R., et al. (2016), Amazon forest response to repeated droughtsGlobal Biogeochem. Cycles30964982, doi:10.1002/2015GB005133

Shukla, J., C. Nobre, and P. Sellers. 1990. Amazon deforestation and climate change. Science 247: 1322-25

Numerous researchers. 2015. Long-term decline of the Amazon carbon sink. Nature 519: 344-348



[1] Feldpausch, T. R., et al. (2016), Amazon forest response to repeated droughtsGlobal Biogeochem. Cycles30964982, doi:10.1002/2015GB005133
[2]http://wwf.panda.org/what_we_do/where_we_work/amazon/amazon_threats/climate_change_amazon/
[3] http://www.cbsnews.com/news/severe-droughts-in-amazon-linked-to-climate-change-says-study/
[4] Feldpausch, T. R., et al. (2016), Amazon forest response to repeated droughtsGlobal Biogeochem. Cycles30964982, doi:10.1002/2015GB005133
[5] Yadvinder Malhi of Oxford University in press release
[6] Shukla, J., C. Nobre, and P. Sellers. 1990. Amazon deforestation and climate change. Science 247: 1322-25
[8] Numerous researchers. 2015. Long-term decline of the Amazon carbon sink. Nature 519: 344-348