The next low-hanging fruit improvement is community solar installations, or barring that, individual home solar installations. Technically, things like better

The next low-hanging fruit improvement is community solar installations, or barring that, individual home solar installations. Technically, things like better insulation are low hanging fruit in the sense that the technology exists and the materials for it are cheap, but it's incredibly labor-intensive, especially when retrofitting old housing stock. Solar is much easier to retrofit onto a home than making a 50+ year old house well-insulated.