I was just wondering if anybody else thought that Planet Earth would have
an enviromental/ecological theme before the tracks became available.
I know he never said it was going to have a theme of any kind but I was just wondering if anyone else thought the same.I thought so also when the album cover became available a few months ago.Anyone else think the same?

Never once. I wondered why many assumed it would. People saw the title and, i guess with the global warming warning campaign high in the news, many assumed it was linked.

To be fair two songs have Earth in the title, the cover features the Earth and title track has ecological aspect. If there is a theme then it is as expected.