Human Influences on Greenhouse Effect: A* understanding for IGCSE Biology 4.12 4.13 4.14

PMG Biology

I established in a previous post that the Greenhouse Effect is a good thing for life on the planet.  So what is the problem?  Well the simple idea is that human activities and the massive growth in human populations seen over the past two hundred years have changed the composition of the atmosphere.  The concentration of greenhouse gases has risen and this enhanced greenhouse effect is causing climate change.

The principal gases in the atmosphere responsible for the greenhouse effect are carbon dioxide, methane and water vapour.  Have a look at these two tables taken from the following website from the Center for Climate and Energy solutions:

http://www.c2es.org/facts-figures/main-ghgs

The first image shows the main gases in the atmosphere that contribute to the Greenhouse Effect.

number-1Anthropogenic means “caused by mankind” and so you can see what humans are doing to generate an enhanced greenhouse effect.  The GWP figure stands for…

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