Wind is actually produced in large part by the warming of the sun. When air warms up due to sunlight, it rises, and cold air rushes in underneath to fill the void. It´s a very dynamic process with air constantly exchanging heat with colder air and with the earth and oceans, and with air constantly rising as it warms, sinking as it cools, and filling in voids because as a gas, one of its properties is to expand to fill any volume. The moving of the air in this manner, is what wind is on the surface of the earth.