The study released yesterday by the Aspen Global Change Institute says the average temperature in Aspen has increased by three degrees in the past 25 years.
Besides eliminating skiing, it will be difficult to find enough water to deal with the growing population and higher temperatures.
The report says hay fields and other crops will require more water.
Rafting seasons and fishing seasons will be shorter because the snow will melt earlier.
The report says some wildlife will not be able to survive.
Aspen Mayor Helen Klanderud says the city is committed to doing what it can to slow or reserve global warming.