What is the most difficult change humans will have to make to combat climate change?

Moving to cars powered by alternative fuels, like electric, hydrogen, natural gas, or nuclear, would probably be the hardest change for people to make in order to reduce greenhouse gas emissions. All of the aforementioned fuel forms produce little to no greenhouse gas emissions; hydrogen cars, for example, only emit water vapor as exhaust.

Infrastructure is the reason such a change would be challenging; people would find it rather inconvenient to own these kinds of cars but not be able to refill them; on the other hand, electric charging stations are becoming more and more common; once the infrastructure to support alternative fuel cars is developed, people would readily switch over.

The most difficult change humans will have to make to combat climate change is likely transitioning away from fossil fuels as the primary source of energy. This involves significant shifts in infrastructure, policy, and societal behavior, as well as overcoming entrenched interests and economic dependencies on fossil fuel industries. Additionally, it requires widespread adoption of renewable energy sources, improvements in energy efficiency, and changes in consumption patterns to reduce carbon emissions effectively.