Replying to The Start Of World War Three

In the past week the terrorist threat from ISIS and all affiliated groups have hit an all time high, largest civilian casualties in France since World War 2.

Once again we have two completely different ideologies and as history shows, only one way of thinking will survive while the other will be almost obliterated. France have made a statement that they will respond to the attacks that have killed 130 and caused critical injury to another 99 by vowing to 'wipe out ISIS' and I would expect other leading Western world countries to follow suit.

David Cameron has warned that we must be prepared for a number of London (where I call home) casualties in the coming days/weeks. Rome, London and Washington DC are all on high alert so if you're in these areas please be cautious.

This wont end until the whole ideology of ISIS is non-existent.

My thoughts and vibes go out to everyone who has been affected by these events across the planet, we should remain strong by continuing on with our daily routines, the terrorists want us to hide and be scared. Therefore we must be bold and strong together.

What are everyones thoughts?
Is this the start of a new international war?
Is this just a one off thing?
Should we respond violently?
What should we do?