Greenhouse gases matter. The heat generated by power plants etc is irrelevant. Venus and Earth receive (very roughly) similar amounts of sunlight. They generat

Greenhouse gases matter. The heat generated by power plants etc is irrelevant. Venus and Earth receive (very roughly) similar amounts of sunlight. They generate similar amounts of heat through radioactive decay in their core. The reason Venus is a hellhole and Earth is, well, Earth - greenhouse gasses.