Changing the albedo changes temperature.
But the effect of the total area of photovoltaic cells is so small that it is insignificant. Paving over cities has a much larger effect over a larger area. Don't worry about it.
We need SOME tax on non-renewable energy sources, including nuclear power, to stimulate the development of renewable energy sources.
While the greenhouse effect may not be the dominant cause of global warming, it is folly to continue burning fossil fuels at an ever increasing rate.
