Placeholder Image

字幕列表 影片播放

  • Planting trees to save the planet SOUNDS like a good idea: trees are about half carbon,

  • which means they're really effective carbon-storage devices.

  • So effective that simply by increasing the amount of forested area on Earth, we may be

  • able to store about a quarter of the carboncarbon dioxide, to be preciseneeded

  • to head off the worst aspects of climate change.

  • That's why we Earthlings are planting about 2 billion of these carbon-storing machines

  • every year!

  • Except there's a problem: if we aren't careful about how we plant trees, we run the

  • risk of actually releasing carbon, instead of storing it away.

  • Hi, I'm Kate and this is MinuteEarth.

  • OK, so issue #1: where should we put all these carbon-storing machines?

  • This big open space seems perfectbut there's actually already an ecosystem here storing

  • tons of carbon.

  • Literally, tons; an acre of native grassland can store as much as 80 tons of carbonaround

  • 2/3 of the carbon an acre of forest can store.

  • Planting trees hereespecially non-native oneswill kill the grasses, disrupt the

  • ecosystem, and un-store basically all its stored-up carbon.

  • The same thing happens when we plant trees in other places, like moors and peat bogs,

  • that may seem empty but are actually established ecosystems storing lots of carbon.

  • When we disrupt those areas to plant new trees, a lot of that carbon gets released.

  • And sure, the trees we plant (if they actually grow) will eventually suck that released CO2

  • (and maybe a bit more) back out of the air, but that will take decadestime that we

  • don't really have.

  • It's way better to leave existing ecosystems like grasslands and peat bogs intact, and

  • focus our efforts in places where forests used to exist, before we cut them for timber

  • or farmland.

  • And that IS where lots of planting projects happen.

  • But there, we make a different mistake when it comes to removing carbonwe plant trees

  • instead of forests.

  • Over half of all international planting projects involve filling deforested areas with row

  • after row of one or two types of fast-growing, non-native trees.

  • These projectswhich are basically tree farmsdo pull carbon from the air, but

  • since the trees are usually grown to be harvested, the carbon they store may not be stored for

  • long.

  • Plus, since these plantings are far less diverse than natural forests, not only do they usually

  • store less carbon in the first place, but they're also much more prone to disease

  • and drought, which can severely limit their carbon-storing abilities.

  • If we really want to store as much carbon as we canand keep it storedwe need

  • to plant forests, not just trees.

  • Of course, protecting our planet from environmental damage isn't only about storing carbon;

  • it's also about conserving native plants and animals, keeping the water clean, and

  • ensuring everyone has the food and medicine they need.

  • But it turns out that planting trees in a way that maximizes how well ecosystems function

  • rather than maximizing the sheer number of treesaccomplishes all these goals.

  • In other words, when it comes to planting for our planet, we need to make sure we see

  • the forests for the trees.

  • Special thanks to the Society for Ecological Restoration and its global partners for their

  • support during this production; and to the Convention on Biological Diversity, which

  • is part of the United Nations Environment Programme.

  • Thanks to Kingsley Dixon and the team at Curtin University and the Centres for Mining Restoration

  • and Healing Country for supporting and sponsoring this video.

Planting trees to save the planet SOUNDS like a good idea: trees are about half carbon,


單字即點即查 點擊單字可以查詢單字解釋

B1 中級 美國腔

When Tree Planting Goes Wrong

  • 37 3
    VoiceTube staff 發佈於 2024 年 03 月 28 日