Placeholder Image

Subtitles section Play video

  • we know the amazon rainforest is a pivotal  part of earth's ecosystem and losing it will  

  • be devastating to the planet we've already lost  20 percent and scientists warn that the rainforest  

  • is coming uncomfortably close to a tipping point  where an irreversible change in the climate system  

  • could transform this luscious landscape intodry savanna-like ecosystem which would be huge  

  • the amazon basin spans over 6 million square  kilometers and is home to one-fifth of the  

  • world's land species it also supports the 30  million people who live and depend on the land as  

  • a source of food medicine and shelter that's not  even including the key role it plays in regulating  

  • the regional and global climate trees absorb water  through their roots and transport it to their  

  • leaves where it's released as water vapor through  small pores in a process called transpiration  

  • as the water vapor rises and condenses it forms  rain clouds over the forest canopy basically the  

  • rainforest is making its own weather for example  one large tree can release 1 000 liters of water  

  • into the atmosphere in a single day the rainforest  recycles this water up to six times before it  

  • moves out of the region but as more trees are cut  down those that remain may not be able to recycle  

  • enough water to survive fewer trees means more  sunlight will hit the forest floor exposing the  

  • forest to higher temperatures since deforestation  began accelerating in the 1970s 800 000 square  

  • kilometers of the amazon have been lost and over  that same period the average temperature of the  

  • basin has risen by one degree celsius scientists  are concerned that if deforestation continues for  

  • another 10 to 15 years the eastern and southern  amazon will turn into a savannah not only would  

  • losing the rainforest mean a drastic change in  this weather system but remember the amazon is  

  • also a well-known and excellent carbon sink this  means that its trees suck carbon dioxide right out  

  • of the air and store it in their biomass through  photosynthesis an estimated 136 to 181 billion  

  • metric tons of carbon are stored this way helping  to slow the rate of global warming but scientists  

  • have found evidence that the amazon could flip  from being a carbon sink to a carbon source if  

  • unchecked deforestation continues some estimates  show that this is already happening in one fifth  

  • of the amazon and yet deforestation continues  between august 2018 and july 2019 tree loss  

  • has increased to more than ten thousand square  kilometers the largest rate in roughly a decade  

  • with scaled-back environmental protections in  the region commercial operations like farming and  

  • logging are expected to continue growing the rate  of deforestation at present fires are typically  

  • set to clear the land for these practices in fact  an estimated 90 of the amazon fires in 2019 were  

  • intentionally set releasing roughly 392 million  metric tons of co2 into the air and in just the  

  • first eight months of 2020 fires added around 226  million metric tons of carbon dioxide into the air  

  • the equivalent of nearly 50 million cars this is  where the scientists forecast comes in according  

  • to their study if deforestation reaches 20 to  25 percent of the amazon it will flip to a dry  

  • savanna the reality check is that we're almost  there current deforestation is at a frightening 17  

  • across the entire amazon basin and approaching  20 in the brazilian amazon so at this point  

  • you're probably wondering we're at our limits and  what can even be done well don't lose hope last  

  • september a motivated group of scientists formed  the science panel for the amazon their plan is to  

  • produce a scientific assessment by 2021 to propose  solutions to help secure the forest's future  

  • there are also ambitious reforestation  projects in areas like abandoned cattle ranches  

  • these reforested areas make up about 23  of destroyed forests and can absorb carbon  

  • 11 times faster than the trees that once stood  there so there is a glimmer of hope and remember  

  • unlike the 2019 to 2020 forest fires in australia  and california that were fueled by climate change  

  • more than 90 percent of fires in the amazon were  set by people which means that we actually have  

  • the power to stop them by changing our behaviors  we can tip the scale in our favor and avoid the  

  • savannah-like conditions that scientists say are  quickly approaching but that's just a projection  

  • it won't become a reality unless we let it the  climate crisis is here and we're here to cover  

  • it let us know what other stories you'd like to  learn more about down in the comments subscribe  

  • to seeker to stay informed and as always thank  you so much for watching i'll see you next time

we know the amazon rainforest is a pivotal  part of earth's ecosystem and losing it will  

Subtitles and vocabulary

Operation of videos Adjust the video here to display the subtitles

B1 amazon deforestation rainforest carbon forest basin

The Amazon Rainforest Could Become A Savannah Within 15 Years, Here’s How

  • 3 2
    林宜悉 posted on 2020/12/30
Video vocabulary