I suppose that by World Problems, you mean terrorism?
Alright...let's see what bush has done..
He's lost ties with the UN, which is one very important link to keep world peace.
He's attacked iraq on a basis of WOMD's, which were never found. In doing so, he triggered a mass of terrorist attacks, including Madrid bombings, beheadings, thousands of innocent iraq citizens killed, and a political conflict with anti war countries like France. In doing so, he removed a leader from the throne who was bad, but no where near as bad as what iraq is now.
Now, he brought "Democracy" to iraq. We can't attack countries like this without worldwide support. The biggest protest in history was against Bush's war. If he did it for democracy, why not help other countries around the world who are in a way more screwed up situation with political leaders then Iraq was. War was not a last resort option for iraq. And now that we're in this mess, Kerry had a better idea...Bring in international support to clear up the mess. One by one, our allies will leave Iraq. Just today, over 30 people were killed in various attacks in Iraq. back when saddam was the ruler, i wouldn't be that scared to go to Iraq. Now, i would do anything NOT to go there.