Name: 【TED】Greg Asner: Ecology from the air (Greg Asner: Ecology from the air)
Uploaded: 2013-12-22T15:15:05.000Z
Duration: 13 min 51 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

Technology can change our understanding of nature.

For centuries, it's been said that female lions

do all of the hunting out in the open savanna,

and male lions do nothing until it's time for dinner.

Well recently, I led an airborne mapping campaign

in the Kruger National Park in South Africa.

That's how far the lion can see in all directions

until his or her view is obstructed by vegetation.

is that male lions are not the lazy hunters

over long distances, usually during the day,

This video shows the actual hunting viewsheds

Red and darker colors show more dense vegetation,

And this is the viewshed right literally at the eye level

All of a sudden, you get a very clear understanding

of the very spooky conditions under which

because it emphasizes how little
we know about nature.

There's been a huge amount of work done so far

to try to slow down our losses of tropical forests,

and we are losing our forests at a rapid rate,

I find it ironic that we're doing so much,

yet these areas are fairly unknown to science.

So how can we save what we don't understand?

Now I'm a global ecologist and an Earth explorer

with a background in physics and chemistry

and biology and a lot of other boring subjects,

but above all, I'm obsessed with what we don't know

the Carnegie Airborne Observatory, or CAO.

It may look like a plane with a fancy paint job,

that can actually measure the chemical composition

that fire out of the bottom of the plane,

and measuring it at nearly 500,000 times per second

Here's an image of the Golden Gate Bridge

in San Francisco, not far from where I live.

Although we flew straight over this bridge,

is its ability to capture the actual building blocks

to actually figure out how fast the plants are growing

The hottest pinks are the fastest-growing plants.

This is what a rainforest might look like

that there are many species living with one another.

But you have to remember that these trees

and what that means is that
they're impossible to understand

just by walking on the ground below them.

So our imagery is 3D, it's chemical, it's biological,

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【TED】Greg Asner: Ecology from the air (Greg Asner: Ecology from the air)

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unknown

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river