Cool Effect, the nonprofit that partners with American Airlines, offers calculators on its site that allow you to see an estimate of your annual carbon footprint, or estimate the tonnes of carbon emitted during a potential trip, whether you’re traveling by phone or car and whether the destination is a cruise or hotel. On its site, you can view projects including a 16,000-acre conservation easement for a CO2-absorbing grassland in Montana that would otherwise be converted to cropland, and a program that places more efficient cookstoves in rural homes in Honduras and claims to reduce carbon emissions by about 3 tonnes per year.