How big of a problem is climate change going to be, provided we don't change our ways on a massive, global scale?
Unless we change our ways, the Earth will face the same runaway effect that occurred on Venus, making it unliveable for life as we know it.
Unless we change our ways on a global scale, planet earth will face mass extinction and become an unliveable place. But there is still hope.
We need to change our ways on a global scale. There is no way that can happen overnight, but there may still be time to save the planet and halt the mass extinction that is already taking place.