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A clear reminder at the right moment, in combination with a twinkle in your eyes, is a well-proven combination of nudges with a powerful effect - sometimes, they can even make an entire city stand still. Forget grumpy old men, fines, and styluses - dance instead!
Nudge: The Dancing Traffic Light

Aggregated information is a simple tool to create a relevant comparisons. Many of the decisions that we make decide how much energy we will use for years to come. Think about the purchase of cars and appliances. Yet we do not take the time to properly consider the long-term costs of the different alternatives that we have in front of us here and now at the dealer.
Nudge: Show the lifetime costs for cars, appliances, light sources in the store (Swedish)

Preselection are both powerful nudges and usually very easy to ignore for those who do not want the preselect - in this case, just one click. Large parts of the climate adaptation must be simple for individuals, and just like that, it will go quickly enough. And what is more simple than something that happens without us having to act?
Nudge: Have green electricity as preselection to benefit renewables (Swedish)

To present vegetarian alternatives in a more appealing way than only by “vegetarian” to get more people to want to try since a lot starts with expectations. It is simple and cheap to apply, and it can be used by anyone who wants to and think it would fit in many restaurants that I have visited.
Nudge: Imaginative words to increase interest in climate-smart food (Swedish)

Since we are social beings who like to do as others, communicative social norms can be an effective way to, for example, get more people to choose vegetarian food or purchase more fruits and vegetables.
Nudge: Show that many people eat vegetarian (Swedish) | Place social messages about fruit and vegetables in the shopping cart (Swedish)

Many of the devices that we use on a daily basis can be set in different ways depending on the functions and performance we want. Having “default”-settings ensures the best choice from a sustainable perspective. It takes a little effort, for example, reading the manual to change the setting so that it becomes less sustainable, which means that the default setting often remains.
Nudge: Use energy saving settings as default on devices (Swedish)

People have a habit of leaving leftover food in restaurants. But informing guests in advance to get a doggy bag instead of throwing away the food is an easy way to change behavior. It can make people take a doggy bag home and thus reduce food waste. Something that more restaurants should introduce.
Nudge: Offer doggy bag as default and create a lunch box instead of food waste (Swedish)

I am attracted to more complex nudges that are based on commitment, empathy, and ego - e.g. asking people to think as if they were in the shoes of the other side and try to respond in a reciprocal manner and more empathetic manner.