(V): Sci-fi writers talked about using algae for long space flights long before we even tried getting to the moon.. Anyway, environmental alarmists have oversimplified natural global warming and cooling cycles and make it out to be something under our control. I remember the old joke that goes "Everyone complains about the weather but nobody does anything about it." The reason we don't need to worry about dramatically overflooded coastlines is because H2O contracts (instead of expanding) when going from solid to liquid. It has to do with the crystaline structure of ice.. the molecules are farther apart when H2O becomes a solid. Also, we probably see more ice above the waterline because there is more air trapped in the ice than you would see in a perfectly clear ice cube. I hadn't thought of this one before, but if the globe was a bit warmer, then there may be increased evaporation, leading to an even higher percentage of water vapor adding to the "greenhouse effect". But the greenhouse effect is only about trapping heat after the suns rays have already penetrated the veil and reached the ground. More rays are deflected with a heavier veil, therefore over time less and less heat is produced, which perhaps helps to usher in the next global cooling cycle. I'm speculating about a lot of this, but the evironmentalists are correct when they start out telling us how complex this system really is. What impresses me is not that it goes from warm to cool, but that the extremes really aren't so extreme. They don't come close to extinguishing all life on earth.