Regardless of your stance on warming, most of the things that might cause it involve a waste of money, pollution, etc., all of which are undesirable for reasons unconnected to warming.
For example, brownouts are caused by too many energy-inefficient appliances trying to get power from a grid that doesn't have enough capacity; it isn't particularly difficult to reduce power consumption by improving insulation, swapping light bulbs with mini fluorescents, etc., and regardless of the effect on the environment, it will definitely reduce pollution, your electricity bill and the load on the grid.
