WEBVTT

0
00:00:00.005 --> 00:00:02.531 L:1%
More than 90% of climate scientists

1
00:00:02.532 --> 00:00:04.488
attribute the increase in global temperature

2
00:00:04.489 --> 00:00:06.520
over the past 30-40 years

3
00:00:06.521 --> 00:00:07.746
to greenhouse gases

4
00:00:07.747 --> 00:00:09.870
that humans have been adding to the atmosphere

5
00:00:09.871 --> 00:00:10.699
since the beginning of

6
00:00:10.700 --> 00:00:13.046
the Industrial Revolution in the 1700s.

7
00:00:13.047 --> 00:00:16.418
The great majority of these scientists agree

8
00:00:16.419 --> 00:00:17.863
that if this warming continues,

9
00:00:17.864 --> 00:00:20.529
it presents significant risks to humankind

10
00:00:20.530 --> 00:00:22.275
and all life on Earth:

11
00:00:22.276 --> 00:00:24.076
to our cities and towns,

12
00:00:24.077 --> 00:00:26.093
our water and food supplies,

13
00:00:26.094 --> 00:00:27.517
and our health.

14
00:00:27.518 --> 00:00:30.302
How do we know that this warming is happening

15
00:00:30.303 --> 00:00:32.473
and that it’s caused by humans?

16
00:00:32.474 --> 00:00:34.476
How strong is the evidence?

17
00:00:34.477 --> 00:00:37.059
What risks can we expect and

18
00:00:37.060 --> 00:00:38.302
what we can do about them?