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Originally Posted by nation-x
Why does it have to be the complete cause? Most of the time when I read articles or hear credible speakers on the subject they are not saying that man is the complete cause... just a huge contributor. It is a proven fact that Carbon Dioxide creates an insulation effect in the atmosphere... this alone is not a problem... the problem lies in the fact that we are producing more Carbon Dioxide than our global "sinks" can absorb. This is causing an increasing warming in the overall global temperature... especially in the oceans.
The biggest risk of global warming is that the ocean currents might change (a logical and "more than likely" scenario) which can cause another ice age... which is inevitable... the earth has had many ice ages... but our continued use of fossil fuels that over-saturate the atmosphere with Carbon Dioxide is accelerating that process. As the ocean currents change it affects how much Carbon Dioxide that the ocean absorbs while simultaneously affecting the circulation mechanism of heat within the oceans... which moderate the temperature of our atmosphere. This is important because in our lifetime we could see that reversal happen if we don't slow our production of these greenhouse gases... as the arctic ice melts it changes how the currents work and changes the overall length of the circulation... eventually it could disrupt the currents enough where it stops circulating as much warm water to the arctic and cause a global drop in temperature. Even 5-10 years of very short summers would cause a worldwide famine.
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The Oceans hold more Co2 than the atmosphere and the dirt combined together. In a single day the Oceans release more Co2 than man can release in a year. Any Volcano that erupts (which happen daily) releases more Co2 than man releases in a year, along with many other toxins.
You breath out Co2... It's a building block of ALL life. You are a Carbon based life form.
Man isn't causing the arctic ice to melt unless man is responsible for it melting over the last 10,000's of years.. and as it melts, more water warms, more co2 is released, less ice means less reflection, thus more heat.. it's a massive cycle inside many small cycles.
None of which we can stop, prevent, or control. If all of man stopped releasing co2, or polluting at every level... nothing would change in the cycles.