Global Trends in Greenhouse Gases

400 3s0 3e0 340 320

320 310 300 290

Carbon

Dioxide

1990

N

itrous

Oxide

(ppb)

1980 1990 2000 2010

2000

2010

250 200 150

Methane

250 200 150

/

C

-FC-11

(ppt)

1980 1990 2000 2010

1990

2000

--

/

C

_FC-12

1980 1990 2000 2010

1.5 2010

500 400

1980 1990 2000 2010

1980 1990 2000 2010

1980 1990 2000 2010

Global trends in major greenhouse gas concentrations. The rise of greenhouse gases, and their resulting impact on the greenhouse effect, are believed to be responsible for most of the increase in global average temperatures during the last 50 years. This change, known as global warming, has provoked calls to limit the emissions of these greenhouse gases (e.g., Kyoto Protocol). Notably, the chlorofluorocarbons CFC-11 and CFC-12 shown above have undergone substantial improvement since the Montreal Protocol severely limited their release due to the damage they were causing to the ozone layer.

At present, approximately 99 percent of the 100-year global warming potential for all new emissions can be ascribed to just the three gases: carbon dioxide, methane, and nitrous oxide.

Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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