What would be the implications if we had no green house gases in our atmosphere?

If we had no greenhouse gases in our atmosphere, Earth would be significantly colder, leading to a dramatic drop in global temperatures. Without these gases, heat from the sun would escape back into space, making it difficult for life as we know it to survive. Most ecosystems would collapse, as plants and animals would struggle to adapt to the extreme cold. Ultimately, the absence of greenhouse gases would result in a planet that is largely inhospitable to life.