Originally Posted by tjspiel

Electrification - both of transportation and heating
Massive investment in energy efficiency (often returned by lower energy costs)
Increased use of renewables AND nuclear (sorry, think it's necessary)
Mixed use zoning
*Huge investment in public transit (more so than cycling infrastructure)
Greater emphasis on pedestrian and cycling friendly infrastructure
Higher density development
promote consumption of locally produced foods another products

From a behavior standpoint we really need to educate people on ALL the costs of their various choices and have them pay accordingly. If somebody really wants or needs that SUV, they can have it, but they must compensate in some way the rest of society for its impact.

Convince people they don't really need power recliners. Pulling a handle isn't all that hard.
Finally we have to ban leaf blowers. I hate those things.

*The degree to which one invests in one or the other should vary by region. I'm not against investing a lot of money in cycling infrastructure but in this climate public transit probably needs to trump cycling infrastructure. That may not be true everywhere.