I think the First Moroccan Crisis is a good place to start. France reached agreements in 1904 with Britain and Spain granting the French control over Morocco. This was met with the hostility of Germany, who took immediate diplomatic action to block the plans from going into effect, with the Kaiser going to Morocco. He made remarks described as an "open door" speech in favour of Moroccan independence.
Germany sought a international conference where the French could be called to account before other European sovereigns. French premier was interested in a compromise solution, but soon refused as French public opinion turned against Germany and the British lent their support to the French position.
Now if handled quickly before the public really got into it, we may not see Britian and France get closer, as well as Germany getting the idea that Austria will be it's ally only if it is backed up. Italy will be given a step into international talks concerning new lands, so it may not have the need to stay with the Central Powers, for its population was never really in favor of the alliance, and it did so over France getting more land in Tunisa.
Now with Germany seeing Austria-Hungary as an ally, but not one it has to shackle itself to, France talking and not posturing about Germany, the UK not taking sides, and Italy not having to choose between two historic competitors, there is the ability to move about. Germany can say "screw you" to AH, the UK can see the conflict and simply sit back and recall nations come to it to settle disputes, and France may just get to see the Germans not as mortal enemies but a nation close by.
The sooner the nations of the world think in realpolitik the sooner WWI can be avoided. Now this isn't saying a war will not happen, just not the war to end all wars.
