I have to say I don't care what Gore says or not, he is not a scientist and it is not his field of expertise. He is just a mouthpiece nothing more (and thus utterly irrelevant to real discussion). Here are some scientific facts (note these are not theories or the like, these are dependable, repeatable, and observable facts)
1. Co2 is a greenhouse gas, it helps trap radiated heat in our atmosphere. Light passes through it but radiant heat does not.
2. Man is pumping massive amounts of Co2 into the environment (along with of course what nature itself produces). This also is readily quantifiable and measurable with a reasonable degree of accuracy.
3. We know more or less what will happen when there is too much Co2 in the atmosphere and oceans because it has happened before in earth's history. Again this is readily observable and even quantifiable with the right knowledge and tools.
Now of course nature has its own effects on all of this, but I don't see how we can rationally deny that we have any part in it, given the massive impact our species is having on the ecosystem (which is also scientific fact and readily observable).
As for algae I am still a bit wary, You can bio-engineer something with out actually directly modifying it genetically, humanity has done that for thousands of years. Also there is still the risk of it getting loose in a non native environment and causing havoc (something we have done plenty of). We have had a long history of implementing technology with out fully considering all the ramifications it will have.
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