Hmmm...the ones who point at the "worst floods in 300 years" as a proof of climate change are simply ignorant, they're not the ones to discuss with when trying to build an opinion.
Yes, earth has gone (and will go) through warmer and colder cycles, and volcanos keep erupting as they've to this day. But don't you think the scientist know it, too????
If the leading scientists, and obviously the majority of all scientists, in the world tend to think global warming is caused by Homo Sapiens (to a significant extent), it takes some attitude by a average guy to say "no it ain't". It's important to understand that they have different opinions on the portions etc. This is not a on/off-question, not black'n'white. It includes lots of variyng versions and degrees.
Even if we cause only 50% of the warming, and the other half comes by nature, it would still be signifigant.
Or even if the change would only be one third of the worst predictions, no matter who's causing it, it would still change the life as we know it. If the change doesn't come...then it doesn't.
The biggest problem in the climate change debate is that handling a topic that carries so catastrophic options to human life, is so difficult. The subject is simply too big and scary. So, nothing, or little, will be done.
And the discussion might include suggestions like forbidding everyday-use of private cars or limiting the use of meat ...no way! We'd rather die! ( :o) I don't mind. It's not dying I'm afraid of. Homo Sapiens is not important. It's the wars, violence and suffering that's hard to think about..