A CONTROVERSIAL project costing tens of millions of pounds will attempt to change the weather. China are ploughing more than £22million into shooting salt-and-mineral-filled bullets into the sky in a bid to make it rain. But Beijing is not alone in its pursuit to play God with the weather, with at least 52 countries, including the US, using weather modification techniques which allows authorities to clear the skies or make it rain. Droughts in places such as the the US and China are one of the biggest constraints on their farming industries, which is why scientists are working to eradicate the the prolonged dry seasons. They will do this by putting chemicals in the sky. Even in the hottest regions of the world, moisture remains in the skies. Before it rains, the moisture particles in the air condense and cool on smaller particles like dust which is how clouds are formed. Once enough of the particles have come together and the clouds get heavier, then it begins to rain. However, the