Well, yes, of course the sun will come up tomorrow.  And the next day, for the next 4-5 billion years.  

But how long will the earth sustain 7+ billion people (and growing) if climate change negatively affects our ability to provide food and water to everyone.    The huge problem is what do about it.  And nobody knows the answers at this point.  AGW appears to be real, and nobody has provided real evidence to the contrary.  Everyone needs to get on board before we can have a rational approach to what can or should be done.

The sun will continue to rise, even long after the sun has set on humanity.  We seem to be quickly approaching the inflection point (and we may already be there) when our decisions today will have an impact on how long humans will continue to have a good tomorrow.