Several options
1. Slightly reduce solar output.
2. Slightly increase the earth's orbital distance.
3. Cause the collapse of industrial civilization and wait a few centuries.
Seriously, there are smart people who feel that the consistently fast Pac jet is a consequence of the "elephant in the room which shall not be discussed in this thread". Which should make your blood run cold (or hot) because it might mean that we will be stuck with it for the foreseeable future. Furthermore it preferentially suck in North America because it causes all the cold air to stick to Eurasia and floods us with Pac puke.