Global Warming and Climate Change

Meagan Scott

http://www.globalissues.org/article/233/climate-change-and-global-warming-introduction#WhatarethemainindicatorsofClimateChange

http://www.globalchange.gov/publications/reports/scientific-assessments/us-impacts/full-report/global-climate-change#font=13

Human activities have led to large increases in heat-trapping gases over the past century.

The Erths climate depends on the functioning of a natural greenhouse effect. The effect is a result of heat-trapping gases (greenhouse gases) like water vapor, carbon dioxide, ozone, methane, and nitrous oxide, which then absorb heat radiated from the Earth’s surface and lower atmosphere and then radiate much of the energy back toward the surface.
Without the natural greenhouse effect, the average surface temperature of Earth would be about 60°F colder. However, human activities have been releasing additional heat-trapping gases, intensifying the natural greenhouse effect, thereby changing the Earth’s climate.

What are the main indicators of climate change?

Explained by the US agency, the National Oceanic and Atmospheric Administration (NOAA), there are 7 indicators that are expected to increase in a warming world, and 3 indicators would be expected to decrease. Temperatures rise, and glaciers, snow, and sea ice are expected to decrease.
main indicators of climate change.jpg

The climate has always varied in the past. How is this any different?

Through Earths history, the climate has always varied.
Recent warming, has been shown to be due to human industrialization processes.
John Cook summarizes the key indicators of a human on climate change:

climate-human-fingerprints.jpg

co2-emissions-past-400000-years.jpg

The graph above covers hundreds of thousands of years and shows how atmospheric CO2 levels have dramatically increased in recent years.
If we zoom in on the past 250 years, we see the following:

co2-emissions-1751-2007.png

:-)

Harry: Not very much infro, but the charts are nice.
Jess Campbell: Could use more information, but the topic is interesting overall.
Leah Scott; very visual. thumb up for effort!:)
Carson Wright: the pictures add input but yea the info is a little low. but still very good job
Liam Winters: I like The Source you have. Great job.
Rebecca Jones: I like the graphs and the information you gave, good job!