Why is the Sky Blue?

It’s an innocent question that children have put to their parents for centuries. We don’t necessarily want a scientific explanation. We just want to know why. Thankfully, there’s a simple answer which took a long time to work out before the answer became readily available on Google. So is it because more than seventy per cent of our planet is water and it’s the light hitting the sea and reflecting back into the atmosphere? Or is it to do with the light entering our atmosphere? After all, it may not be blue in the future once global warming has had its way. Once we’ve got more gases and particles in the air; it might be purple. And it’s not blue all the time. It also tends to be white when we experience large clouds. But could you imagine the sky to be green? Perhaps only if you’re standing underneath a clump of trees. But if you try to picture a cityscape with a green background, you may well find it nigh impossible. I get a vision of a green screen that film editors use to create special effects. I suppose the only way is to photoshop a picture and find out. You could argue that it’s because green isn’t a natural colour as it isn’t primary; but I always argue against this because of the natural colour of grass. And because of this, some people may just argue that the sky was blue because that was the cheapest colour in the store…