How Mirrors Could Solve our Energy Problem

Assuming X amount of solar energy hits a given area on Earth based on the geography. Is taking some of that energy and using it to create extreme heat in concentrated locations going to have a positive or negative impact on climate change? Will it create heat zones like a city does causing disruption in weather patterns? Or assuming some less than 100% efficiency, would less than the total energy drawn from the sun by converted and that energy loss help reduce local heating? 

What are the non-electrical generation impacts to the environment?