Climate scientist Brian Brettschneider has created an updated map for a cross-country road trip in the United States where the temperature remains a constant 70 degrees Fahrenheit. The map, based on daily “normal” high temperatures, offers multiple routes that span the country and have been widely shared since their initial release in 2015. 

Key points: 

1. Climate scientist Brian Brettschneider has released an updated version of his road trip map where the temperature is always 70 degrees Fahrenheit.
2. The map is based on daily “normal” high temperatures from the National Centers for Environmental Information.
3. The updated routes include both a coastal path and an interior route, staying below 8,000 miles in length.
4. A longer route that includes Alaska and Canada has also been added, using mathematical concepts due to the absence of updated climate data in Canada.
5. While climate change had a minimal impact on the new map, it is expected to have a larger effect in the future.
6. Brettschneider, an avid mapmaker, is interested in hearing from anyone planning to embark on the road trip.