1
00:00:02,930 --> 00:00:05,850
*Birds Chirping fades out as music begins.*

2
00:00:05,850 --> 00:00:07,230
Narrator: Trees.

3
00:00:07,230 --> 00:00:11,450
Diverse, they can be towering giants or petite saplings.

4
00:00:11,450 --> 00:00:17,100
Some live for thousands of years recording their age in rings.

5
00:00:17,100 --> 00:00:22,830
They provide food, shade, shelter and more for wildlife and for us.

6
00:00:22,830 --> 00:00:25,150
Some tell us when the seasons change through their leaves.

7
00:00:25,150 --> 00:00:27,340
*Elk bugles in distance*

8
00:00:27,340 --> 00:00:30,930
While others continue to stand steadfast throughout the year.

9
00:00:30,930 --> 00:00:34,880
But no matter their differences, their height can reveal information

10
00:00:34,880 --> 00:00:37,300
About their ecosystems.

11
00:00:37,300 --> 00:00:40,020
By using satellites and ground based measurements 

12
00:00:40,020 --> 00:00:45,990
Scientists can track tree growth and monitor how well an ecosystem supports trees.

13
00:00:45,990 --> 00:00:49,520
Tree height is also used to measure the biomass of a forest.

14
00:00:49,520 --> 00:00:53,870
Allowing scientists to calculate how much carbon is stored by trees.

15
00:00:53,870 --> 00:00:57,930
These are all important factors

16
00:00:57,930 --> 00:01:02,040
In conservation, resource management and monitoring the climate.

17
00:01:02,040 --> 00:01:06,800
By using only a smartphone and the GLOBE Observer app, citizen scientists and students

18
00:01:06,800 --> 00:01:13,120
Are helping create a global inventory of tree height. Available for everyone to use.

19
00:01:13,120 --> 00:01:14,980
You can collect your own tree height data by downloading and using the GLOBE Observer app.

20
00:01:14,980 --> 00:01:17,140
GLOBE Observer. observer.globe.com

21
00:01:17,140 --> 00:01:20,680
GLOBE Observer Supported by globe.gov

22
00:01:20,680 --> 00:01:21,870
Explore Earth

23
00:01:21,870 --> 00:01:22,686
NASA