What if there were two suns? Woohoo~~

What if you woke up one morning and there were two suns in the sky? It wouldn't just be twice as bright; Earth's climate, seasons, length of night, and even ecosystems could be completely different from what they are now. The outcome would also vary greatly depending on how close the two suns are and their orbital paths. In reality, binary star systems where two stars orbit each other are common in the universe, so it's not just a science fiction concept. So, what changes would occur on Earth if there were two suns? I think Earth would have become a completely different planet if there really were two suns.