Download presentation
Presentation is loading. Please wait.
Published byJustina McKenzie Modified over 9 years ago
1
Global Climate Change
2
150 Authors 1,000 Contributing Authors 5 Years Work 130 Countries 1,000 Expert Reviewers The Famous “IPCC Report”
3
Vostok Ice Core Looking Back in Time
4
Temperature From 650,000 Years Ago N20N20 CH 4 CO 2 T Thousands years before 1950
5
Temperature From 1,300 Years Ago Year Little Ice Age Medieval Warm Period Temperature Change (°C)
6
Temperature From 150 Years Ago Year ~1°C Temperature Change (°C)
7
SurfaceAbove Where is This Happening?
8
An Explosion of New Data Oceans are warming Glaciers are retreating Ice sheets are melting Sea level is rising Sea-ice is melting
9
Oceans are Warming Year Heat Content Change
10
Photos: US Geological Service, via National Snow and Ice Data Centre 1909 Toboggan Glacier, Alaska 2000 Glaciers are Retreating Year Length Change (m)
11
Ice Sheets are Melting Elevation Change (cm/year)
12
Reconstructed sea level fields Tide gauges Satellites Sea Level is Rising ~20 cm Year Sea Level Change (mm)
13
Sea-ice is Melting Year Millions of square km
14
Why is This Happening? Climate models used to understand and predict climate change Based on physical principles, and subject to extensive validation
15
Observations Climate Models
16
Observations Climate Models
17
What About the Next 20 Years? 0.5°C
18
What About the Next 90 Years? 1-4°C
19
And the Next 300 Years?
20
Expect Sea Level Rise ~ 0.5 m Sea Level Change Anomalies
21
Expect Large Warming Over Land Temperature Change (°C)
22
Expect Regional Precipitation Change Precipitation Change
23
Heavier Precipitation Longer Growing Season More Heat Waves More Drought
24
Winners and Losers
25
Key Messages The climate has warmed, will continue to warm, and humans are the cause Mitigation will not substantially affect the climate over the next few decades But, choices made now will have a big impact on the late 21 st century climate
26
Global Climate Change
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.