CLIMATE CHANGE: What We Know and What We Don't Know. Baased on a Presentation by Daniel L. Albritton, Director of NOAA Aeronomy Laboratory, during early 2001. There is a natural Greenhouse Effect. It keeps the earth warmer than it would be otherwise. Our planet’s atmosphere is composed of:.
Baased on a Presentation by Daniel L. Albritton,
Director of NOAA Aeronomy Laboratory, during early 2001.
Dry Air Composition:
without water vapor
It warms up
It emits infrared light (heat)
They cause an average surface temperature of about 60oF.
Without them, the average would be about 5oF.
-Carbon Dioxide has increased by 31% between 1800 and 2000, as measured by ice cores and air samples
-Other gases have increased, too:
What is the main cause of this increase?
-Global temperatures are up 0.7 - 1.4 oF over the past 100 years
-Which seems to be causing:
Freeze-free periods lengthened
Sea-level increased 4-8 inches
as much as 40% above average
with large differences between regions
will be more or less frequent
*Remember your three Rs! Reduce, Reuse, Recycle!
What can you do?