I had an amazing dream this morning. I was standing on top of a city that consisted of a collection of small houses, which we realised would have to be turned into a tower for defensive reasons. Just then a tiny spaceship about the size of a coffee pot came and settled in my hand. It started making a humming noise, so I put it to my ear and I could hear a message. The message was that we must stop hurting the Earth. The aliens who had sent the message had despoiled their own planet with pollution and carbon in the atmosphere, and they wanted to save us from the same fate.