Why should I change my Habbit?

The climate of the Earth is always changing. In the past it has altered as a result of natural causes. What is now referred to as "climate change" are changes that have occurred since the beginning of the last century and are continuing now. The Intergovernmental Panel on Climate Change (IPCC) states that there has been a "discernible human influence on the climate".

 

                 

The Arctic ice-floe has decreased in thickness by more than 40% since 1960. In 2006 it was forecast that the Arctic could be ice-free in summers by 2040.

Is it really caused by human activity?

There are few scientists who do not believe climate change is not being caused by human activity. In the last 150 years (since the start of the Industrial Revolution) the amount of carbon dioxide in the atmosphere has raised from 600 billion tonnes to more than 800 billion tonnes. It is inconceivable that this increase in carbon dioxide concentration was caused by anything other than human activity.

                   

But does it really matter?

The global climate is a complex system with many factors that cause global temperatures to rise and fall. This includes the impact of differing solar radiation (or solar pulses) which some people have held up to be the principal cause of global climate change. This is unlikely to be the main cause of change.

There is a strong correlation between global carbon dioxide concentrations and the Earth's temperature. Carbon dioxide and other greenhouse gases (GHG) act to trap infrared solar radiation from being reflected away from the Earth's surface (hence greenhouse effect). As the amount of carbon dioxide rises, so do global temperatures.

Global warming today

Today the atmosphere has the capacity to absorb only one third of the CO2 that we produce each year.

The estimated stockpile of fossil fuel (oil, gas, coal) would equal the energy of 11 days of sun over the entire surface of the earth, which suggests excellent possibilities for solar energy.

CO2 emissions due to human activities are responsible for more than 60% of the increase in the greenhouse effect.

In the course of his or her life, a child born in an industrialised country will consume more and generate more pollution than 30 to 50 children born in a developing country.

The hole in the ozone layer did not exist before 1975. 28 years later, in September 2003, it had spread to a record surface of 28 million km2 in the southern hemisphere (more than 3 times the surface of the US).

 

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Each one (of the Earth's 5 million invertebrate species) plays a role in its ecosystem. It's like we're tearing the cogs out of a great machine. The machine might work after you tear out ten cogs, but what happens when you tear out a hundred?
(Scott Black)
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