Sure, replace fossil fuels for electricity generation with renewables and/or nuclear. Replace fossil fuels in cars with batteries. Replace fossil fuels for heating with electricity.

Each of those saves on the order of 20% of emissions and could be done in less than a decade if we put maximum effort into it.

I really doubt convincing a sufficient number of people to not have children is easier than any one of those measures. Just imagine the political backslash if the government suggested not to have kids for the climate. It's a lot easier to convince people to stop eating meat for the climate and even that is essentially impossible.