All energy produced in any type of power plant eventually becomes heat. Fossil fuels have the additional property of making Earth retain more of it. Solar coul

All energy produced in any type of power plant eventually becomes heat. Fossil fuels have the additional property of making Earth retain more of it. Solar could also increase the temperature if it traps energy that would otherwise be immediately reflected back to space. I'm not sure if the difference is significant, though, compared to the effect of greenhouse gases.