Human body is made up of 37 trillion cells. Even a slight prick of a pin causes enough sensation that our entire attention is shifted to the point of piercing.
The universe, like human body, is also a colony of trillions of entities. Each one of us is a cell in the universal body. If nine million people meditated exactly at the same time in different parts of the world, the law of attraction will work at an extraordinary scale.
When hundreds of thousands (if not millions) of people will meditate at exactly the same time, on the same thought, it will have an enormous impact on not just every meditator but on the whole world.
If we raise the level of global happiness, personal peace and prosperity will rise automatically. With more and more happy people around, our world will naturally become a better place.
Take a few minutes to understand the philosophy deeper.