The main idea behind passive cooling is to reduce the impact of the sun by orienting the landscape and the house so that you get the most benefits out of cool breezes. The home also has to be designed to reduce barriers to air paths through the home to let natural ventilation in. You need to use the right type and size of windows to reduce the heat during extra hot days. People will have to prepare for the consequences of running out of this resource. Helping the Environment Solar energy is non-polluting. This means that you can save the ecosystem and keep greenhouse gases from forming. You can expect a cooler and cleaner surrounding by investing in solar powered devices. Do the same with the heated piece of copper. The two pieces should not touch each other. Link an alligator-clip lead to every copper. Connect the lead from the second copper piece to the positive terminal of the micro-ammeter. Stir salt until fully dissolved using hot water. Pour the salt water into the bottle. The primary advantage of this kind of system is the cheap price of utility. The system needs to be wired with an inverter that creates pure-sine-wave AC electricity, which is needed for linking to the utility grid. Another benefit of this electric system type is the tax incentives. There are also rebates provided depending on the local agency and the state. Once the solar energy runs out, electricity coming from the utility will take over. The flow of solar energy electricity is measured via a utility meter that spins forward and backward. The meter will move backward if more energy is produced than needed and the meter will move forward when extra power is required from the utility company. The solar cells continued transmission for more than a year after the chemical battery exhaustion. The operation of solar cells during the mission was considered to be very successful and was duplicated in several American and Soviet satellites. PV has become the established power source by the late 1960s.