Earth Hour 2010: How many we could save in 1 hour? (theoretically)

I bet many people was wondering how much we save during the 1 hour we switch off our light. Well…this is based on my novice calculation.

Let say 1 billion user pledge to switch off 1 60Watts light bulb for 1 hour

60 x 1 billion x 1 hour = 60 billion Watts  = 60 million kWH

1 kwH roughly produce 16.44 pounds of CO2 emission

so, 60 millions x 16.44 pounds CO2 = 986,400,000 pounds of CO2 or 447,423.51 metric tonnes of CO2.

we need 2,700,000 trees to offset this carbon per year!!

Well, how much is 1 tonnes of CO2 worth

One tonne of carbon dioxide gas would fill a cube over 8 metres high.

Because we can relate to this illustration physically it provides a better sense of scale than the abstract number itself. Breaking large volumes up into discrete quantities (such as a number of one-tonne cubes) makes comparison easier. As viewers, we sometimes struggle to compare volumes, but we are very adept at comparing discrete quantities (numbers) of things.

1 tonnes of CO2 emission will increase the global temperature about  0.0000000000015 degrees celcius

Until now, it has been difficult to estimate how much climate will warm in response to a given carbon dioxide emissions scenario because of the complex interactions between human emissions, carbon sinks, atmospheric concentrations and temperature change. Matthews and colleagues show that despite these uncertainties, each emission of carbon dioxide results in the same global temperature increase, regardless of when or over what period of time the emission occurs.

These findings mean that we can now say: if you emit that tonne of carbon dioxide, it will lead to 0.0000000000015 degrees of global temperature change. If we want to restrict global warming to no more than 2 degrees, we must restrict total carbon emissions – from now until forever – to little more than half a trillion tonnes of carbon, or about as much again as we have emitted since the beginning of the industrial revolution.

“Most people understand that carbon dioxide emissions lead to global warming,” says Matthews, “but it is much harder to grasp the complexities of what goes on in between these two end points. Our findings allow people to make a robust estimate of their contribution to global warming based simply on total carbon dioxide emissions.

via GLobalWarmingBlog

carbon footprint calculator –

to be continued….


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