The Colorado communities of Boulder County, San Miguel County, and the City of Boulder—with legal support from EarthRights International, Niskanen Center, and other co-counsel—filed a lawsuit against Suncor and ExxonMobil ("Exxon"), two oil companies with significant responsibility for climate change. The communities have demanded that these companies pay their fair share of the costs associated with climate change impacts so that the costs do not fall disproportionately on taxpayers... Over the next three decades, these communities will face at least one hundred million dollars in costs to deal with the impacts of climate change caused by the use of fossil fuel products like those made and sold by Suncor and Exxon...Together, Suncor and Exxon are responsible for billions of tons of CO2 emissions. Their future carbon footprint is likely to be enormous, as well: both companies plan to expand fossil fuel production through tar sands, fracking, and other means...For more than 50 years, these oil companies have known about the harm that their products would cause to communities, but have chosen to continue business as usual...Consequently, Boulder County, San Miguel County, and the City of Boulder have partnered together to represent communities on the Front Range and the Western Slope and require these companies to help pay for the costs of climate change on local communities in Colorado.