Well, the OP has certainly got people on Gransnet talking about the concept of world peace, ironically not always amicably and sometimes very negatively. Nevertheless, thinking about such a complex and complicated idea and then talking about it is surely a step towards taking some sort of action.
Any action taken will inevitably start with small steps and there will, equally inevitably, be many setbacks but that doesn't mean that it can't grow massively with time. Someone earlier mentioned the abolition of the slave trade, a discussion started by a small group facing up to hugely powerful people who had grown very rich in this lucrative enterprise. Slavery still exists in the world, even in the UK, but the light still burns to stop it. Emancipation and universal franchise started small but gained a grip in a vast number of countries across the world and the cause is still going.
The cliché that even the longest journey begins with just one step is a cliché because it is true.