The suit cites climate calculations, and is supported by NASA climate scientist James Hansen, who has a history of speaking out forcefully on the hazards of human-caused global warming. Hansen said he had been interested in going to court over the topic in recent years.
The suit is based on the Public Trust Doctrine, a long-standing legal doctrine that states it is the government's duty to protect the resources that are essential for our collective survival and prosperity, such as rivers, groundwater, or in this case, atmosphere, according to Our Children's Trust, a nonprofit advocacy organization behind the litigation.
"So far politics have governed what governments are doing about the climate crisis, and the Public Trust Doctrine is about putting the science back into climate protection," said Julia Olson, director of Our Children's Trust. "And that is what we are asking courts to do."
The group is behind a number of other lawsuits filed against state governments, including Alaska and Arizona, based on the same legal reasoning and with other young plaintiffs, according to Olson.
"We have kids in Alaska who are seeing their glaciers melting and their homes becoming unstable because of the melting permafrost, and kids in Arizona where it is becoming hotter and drier. … They are already experiencing drought and less ability to grow their own food," she said.
The federal lawsuit discusses how the individual teenage plaintiffs have been or will be affected by climate change. For example, if no change is made to our current rate of greenhouse gas emissions, within 16-year-old plaintiff Alec L's lifetime, sea level is expected to cover the waste water treatment center, the power generating station, the freeway, beaches and hundreds of homes in his hometown, Ventura, Calif.
"Our atmosphere must be returned to equilibrium of less than 350 parts per million (ppm) carbon dioxide to prevent heating beyond 1.8 Fahrenheit (1 Celsius), which scientific analysis deems catastrophic. Our atmosphere is now at approximately 390 ppm," according to the suit. (Carbon dioxide is the most potent greenhouse gas.)
To meet the 350 ppm goal, carbon dioxide emissions need to peak in 2012 and then decline by a global average of 6 percent per year until 2050 and 5 percent per year until 2100, according to the suit.
If carbon dioxide emissions aren't reduced in time, the Earth will pass a tipping point with irreversible, catastrophic consequences, including the disintegration of ice sheets and large-scale extinction of species, according to the scientific analysis Hansen provided to the lawsuit.
"If governments fail to adopt policies that cause rapid phase-down of fossil fuel emissions, today's children, future generations and nature will bear the consequences through no fault of their own," Hansen and other climate change scientists write in a paper that summarizes the research underpinning the legal argument in the suit.
The public appeal of a suit led by teenagers may be greater than its chance of convincing the court to compel the government to take action, according to Kilaparti Ramakrishna, vice president and director of policy at the Woods Hole Research Center.
"How can you claim a particular impact in Massachusetts or New York is due to what the U.S. government has or has not done," Ramakrishna said. "It could just as well be what Japan has done or not done, or what China has done or not done."