97% of the water on earth is in the ocean (
http://ga.water.usgs.gov/edu/waterdistribution.html), so that's all that matters. Surface fresh water is inconsequential.
You're not out of line.
The volume of the ocean is 1,338,000,000 cubic kilometers. Some people think the relationship between water and CO2 play a large role in the temperature of the earth. As the temperature of the oceans rise, the water can hold less dissolved CO2, so excess is released into the atmosphere. The vapor pressure of the water also increases with temperature, so more moisture is released into the atmosphere. Both of these are 'greenhouse gasses' and may cause the temperature of the earth to increase, which leads to more CO2 and water being released from the ocean, which leads to higher temeratures, and on, and on. Some think this may help explain the highly cyclical nature of the earth's temperature over the millenia.
If you watch the news, what's written above is all a bunch of crap. People cause climate change and the last ice age couldn't have possibly happened since no one was around to drive SUVs and ruin the environment.
Ozone layer? That was sooo 1990's hysteria. Get with the times.
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