1. Clouds and climate

2. It’s a cloudy world Without the reflection of sunlight from clouds, Earth’s surface temperature would be 25 o F warmer

3. Clouds in climate models change in coverage of low clouds when CO 2 is doubled (from 280 to 560 ppm, currently 400 ppm) NOAA NCAR model number Global warming [ o F] 12 10 8 6 4 2 0 Maps of predicted changes in low cloud cover

4. S PAIN F RANCE B AY OF B ISCAY Ship

5. Measuring clouds off the coast of Chile

6. Droplet rich Clouds (polluted) Droplet rich Clouds (polluted) Droplet poor Clouds (clean) Droplet poor Clouds (clean) Pollution affects clouds PERU CHILE Aircraft track