Image via WikipediaSolar projects are feeling the heat from labor unions, pressuring them into using union workers to build solar farms. One such company is Ausra, which rejected demands to use only union workers for their plan of building a large solar power plant in California. It faces complaints from the union about the environmental impact the plant has on creatures such as the ferruginous hawk and the kangaroo rat.Its competitor, BrightSource Energy, also filed plans for a much larger so