Space Ring Could Shade Earth and Stop Global Warming

An interesting idea found by Tim Worstall that a space ring could shade the Earth and stop global warming better than the Kyoto Protocol. While it would be very cool to have an extensive ring system, and be the only rocky planet to do so, there could be problems, such as with this many small particles around it would make for a very hazardous enviroment for saterlites, and returning to a pre saterlite age (as with uninventing any technology, as greens always seem to want) would be a major hardship for civilisation due to, for example, the degradation in accuracy of weather forcasting.