Related Clues:

• Two notes: some energy is what all should be (like others' grass?)
• Like the grass on the other side
• More grassy
• Like more desirable pastures
• Like the grass on the other side, in a saying
• Less trained
• Comparatively conscious of the environment
• Novelist initially rather more environment-conscious
• Fresher turned up in lecture, we noted
• It supplies meagre energy, better for the environment
• More eco-friendly
• Author reaches end of career more concerned about the environment
• Built later
• More gullible, but at the same time more colourful
• More markedly different than before; not so old